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Glossary

A

access control entry (ACE)

access control entry (ACE)

In an access control list, a grant of permissions to perform various operations on an object. Each access control entry grants permissions to a specific user or group of users.

access control list (ACL)

access control list (ACL)

Optional metadata consisting of a set of grants of permissions to perform various operations on an object. Permissions can be granted to individual users or to groups of users.

ACLs are provided by users or applications and are specified as either XML or JSON in an XML request body or as request headers.

Access key

Access key

The Base 64 encoding of the username for a user account.

active active link

active/active link

A replication link on which data is replicated in both directions between the two HCP systems. The HCP tenants and namespaces and default-namespace directories included in the link are read-write on both systems.

Active Directory (AD)

Active Directory (AD)

A Microsoft product that, among other features, provides user authentication services.

Active Directory domain

Active Directory domain

A structural unit within Active Directory that serves as a container for objects such as users and groups.

Active Directory forest

Active Directory forest

A structural unit within Active Directory that contains collections of Active Directory domains.

active passive link

active-passive link

A replication link on which data is replicated in one direction between the two HCP systems. The HCP tenants and namespaces and default-namespace directories included the link are read-write on only one system at a time.

active search facility

active search facility

The search facility selected for use with the HCP Search Console. This can be the metadata query engine or the HDDS search facility.

active storage

active storage

The total amount of primary storage space, excluding the space required for system overhead and the operating system being used.

advanced search

advanced search

A type of search available in the HCP Search Console. An advanced search lets you specify multiple text- and or metadata-based criteria and also combine those criteria by using parentheses and Boolean and other operators.

alert

alert

A graphic that indicates the status of some particular element of an HCP system in the System or Tenant Management Console.

allow list

allow list

A list of IP addresses that are allowed access to the HCP system when using a particular external interface (such as the System Management Console, a namespace access protocol or the HTTP protocol).

Amazon Web Services

Amazon Web Services

The set of infrastructure and application services that make up the Amazon cloud computing platform. These services include a user authentication method that is also implemented in HCP.

annotation

annotation

A discrete unit of custom metadata.

anonymous access

anonymous access

A method of access to a namespace wherein the user or application gains access without presenting any credentials. See also authenticated access.

Appliance Operating System

Appliance Operating System

The operating system installed on each HCP node.

archive

archive

The body of data stored in an HCAP 2.6 or earlier system, including both fixed-content data and metadata.

atime

atime

In POSIX file systems, metadata that specifies the date and time a file was last accessed. In HCP, POSIX metadata that initially specifies the date and time at which an object was ingested. HCP does not automatically change the atime value when the object is accessed.

Users and applications can change this metadata, thereby causing it to no longer reflect the actual ingest time. Additionally, HCP can be configured to synchronize atime values with retention settings.

authenticated access

authenticated access

A method of access to the HCP system or a namespace wherein the user or application presents credentials to gain access. See also anonymous access.

authentication

authentication

See user authentication.

aws


© 2015, 2019 Hitachi Vantara Corporation. All rights reserved.

B

bond

bond

A pair of ports that share an IP address.

bucket

bucket

The Hitachi API for Amazon S3 term for a namespace.

C

canned ACL

canned ACL

A predefined set of grants of permissions.

capacity balancing service

capacity balancing service

The HCP service that ensures that the percentage of space used remains roughly equivalent across all the storage nodes in the system.

capacity

capacity

The total amount of primary storage space in HCP, excluding the space required for system overhead for all data to be stored in primary running storage and primary spindown storage, including the fixed-content data, metadata, any redundant data required to satisfy services plans, and the metadata query engine index.

chargeback report

chargeback report

A report that contains historical statistics about tenant or namespace capacity and bandwidth usage, broken out either by hour or by day. You can generate chargeback reports that contain a single set of statistics for each tenant or namespace covering the past 180 days (or as much of that time period for which the statistics are available).

chunk distribution

chunk distribution

A distribution method for erasure-coded protection where, after an object is ingested, the chunks for the object are calculated and distributed among the systems in the erasure coding topology.

CIFS

CIFS

Common Internet File System. One of the namespace access protocols supported by HCP. CIFS lets Windows clients access files on a remote computer as if the files were part of the local file system.

comma-separated-values (CSV) file

comma-separated-values (CSV) file

A text file containing tabular data. Each line in a CSV file corresponds to a table row and contains a set of comma-separated values, each of which corresponds to a table column.

compliance mode

compliance mode

The retention mode in which objects under retention cannot be deleted through any mechanism. This is the more restrictive retention mode.

compression service

compression service

The HCP service that compresses object data, thereby freeing space for the storage of additional objects.

container

container

The HSwift term for a namespace.

content class

content class

A content class is a named construct that is used to characterize objects in one or more namespaces. Content classes use object metadata to impose structure on the unstructured namespace content. They do this through content properties.

content property

content property

A content property is a named construct used to extract an element or attribute value from custom metadata that's well-formed XML. Content properties use XPath expressions to identify the metadata of interest.

content verification service

content verification service

The HCP service that ensures the integrity of each object by checking that the object data still matches its cryptographic hash value.

core software

core software

See HCP core software.

cross mapping

cross mapping

In SAIN systems, the mapping of two sets of logical volumes to two nodes such that each set maps to both nodes.

cryptographic hash value

cryptographic hash value

A system-generated metadata value calculated by a cryptographic hash algorithm from object data or object data and metadata. This value is used to verify that the content of an object has not changed.

ctime

ctime

In POSIX file systems, metadata that specifies the date and time of the last change to the status of an object. In HCP, POSIX metadata that specifies the date and time of the last change to the metadata for an object. For a directory, this is the time of the last change to the metadata for any object in the directory.

custom metadata search

custom metadata search

A search that returns objects based on the XML elements, attributes, and/or values in their custom metadata.

custom metadata

custom metadata

User-supplied information about an HCP object. Custom metadata is specified as one or more annotations, where each annotation is a discrete unit of information about the object. Users and applications can use custom metadata to understand repurpose object content.

D

data access account

data access account

In HCP releases earlier than 5.0, a set of credentials that gives a user or application access to one or more HCP namespaces. For each namespace, the account specifies which operations the user or application can perform.

data access path

data access path

In SAIN systems, the path established by the mapping of a logical volume to a node.

data access permission mask

data access permission mask

A set of permissions that determine which of these operations are allowed in a namespace: read (including read ACL), write (including write ACL and change owner), delete, purge, privileged operations, and search. Data access permission masks are defined at the system, tenant, and namespace level. The effective permissions for a namespace are those that are allowed at all three levels.

data center

data center

In VMware vSphere, a logical unit for grouping and managing hosts.

data migration

data migration

The process of moving data off devices that are being retired from an HCP system into free storage on the remaining devices. The devices involved can be either storage nodes in an HCP RAIN system or storage arrays in an HCP SAIN system.

data migrator


Data Migrator

See HCP Data Migrator (HCP-DM).

© 2015, 2019 Hitachi Vantara Corporation. All rights reserved.

data outage

data outage

A situation in which one or more objects are inaccessible (for example, due to multiple concurrent node failures).

data protection level (DPL)

data protection level (DPL)

The number of copies of the data for an object HCP must maintain in the repository. The DPL for an object is determined by the service plan that applies to the namespace containing the object.

data recovery

data recovery

For an active/passive replication link, the process of copying data from the replica back to the primary system after the link has been failed over.

database

database

An internal component of an HCP-VM system that contains essential data about the system, users, and user's files. The database is maintained by one node and copied to the other.

datastore

datastore

A representation of a location in which a virtual machine stores files. A datastore can represent a location on a host or an external storage location such as a SAN LUN.

dead properties

dead properties

For WebDAV only, arbitrary name/value pairs that the server stores but does not use or modify in any way.

default namespace

default namespace

A namespace that supports only anonymous access through the HTTP protocol. An HCP system can have at most one default namespace. The default namespace is used mostly with applications that existed before release 3.0 of HCP.

default tenant

default tenant

The tenant that manages the default namespace.

deleted version

delete marker

A special version of an object that indicates that a version of the object has been deleted. A delete marker has a version ID but does not have any data or metadata.

deny list

deny list

A list of IP addresses that are denied access to the HCP system when using a particular external interface (such as the System Management Console, a namespace access protocol, or the HTTP protocol).

disposition service

disposition service

The HCP service that automatically deletes expired objects.

disposition

disposition

The automatic deletion of an expired object by HCP.

distributor key

distributor key

The name that determines the SSH keys required for access to the HCP nodes when they’re locked down and for general troubleshooting purposes.

DNS manager

DNS manager

The HCP runtime component that provides host-name resolution services to clients. It also balances requests across all nodes to ensure maximum system throughput and availability.

domain name system

domain name system

A network service that resolves domain names into IP addresses for client access.

domain

domain

A group of computers and devices on a network that are administered as a unit.

downstream DNS server

downstream DNS server

A DNS server through which client requests are routed to HCP.

duplication elimination service

duplication elimination service

The HCP service that transparently eliminates redundant data, thereby freeing space for the storage of additional objects.

duplication elimination

duplication elimination

The process of transparently eliminating redundant data associated with two or more identical objects.

dynamic DPL

dynamic DPL

A namespace data protection level that, at any given time, matches the system-level DPL setting.

E

effective permissions

effective permissions

For a tenant, effective permissions are the permissions included in both the system-level and tenant-level permission masks.

For a namespace, effective permissions are the permissions included in all three of the system-level, tenant-level, and namespace-level permission masks.

For a user or application accessing a given namespace, the effective permissions are the permissions included in both the user permissions and the effective permission mask for the namespace.

enterprise mode

enterprise mode

The retention mode in which these operations are allowed:

oPrivileged delete

oChanging the retention class of an object to one with a shorter duration

oReducing retention class duration

oDeleting retention classes

This is the less restrictive retention mode.

erasure coding

erasure coding

A method of data protection where data is encoded and broken into multiple chunks that are then stored across multiple HCP systems. All but one chunk contains object data. The other chunk contains parity for the object data.

erasure coding topology

erasure coding topology

A named configuration of HCP systems and active/active replications links, where those systems and links form an active/active ring replication topology or a fully networked active/active replication topology. Each tenant included in the erasure coding topology is replicated on every link in the topology. Objects in the replicated namespaces are protected by erasure coding.

erasure-coded object

erasure-coded object

An object for which the HCP system stores a data or parity chunk, where that chunk is the result of erasure coding.

erasure-coded protection

erasure-coded protection

A method of geo-protection where the data for each object in a replicated namespace is subject to erasure coding. Erasure coding requires three through six HCP systems but reduces the storage footprint of geo-protection.

ESXi

ESXi

See VMware ESXi.

ETag

ETag

An identified for the content of an object.

expired object

expired object

An object that is no longer under retention.

extended storage pool

extended storage pool

A grouping of external storage volumes.

extended storage

extended storage

Data tiered to storage devices outside of the HCP system.

external storage volume

external storage volume

A logical volume on storage managed by a device that is outside the HCP system.

F

facet

facet

An object property for which a query returns summary information, specifically the values of that property that occur in the result set and the number of objects that have each of those values.

failback

failback

The process that restarts replication on a link that has been failed over and returns the HCP systems involved in the link to normal operation. Typically, you fail back a link when an unavailable system becomes available again.

failover

failover

The process that stops replication on a replication link. Typically, you fail over a link when one of the systems involved in the link becomes unavailable.

fast object recovery service

fast object recovery service

The HCP service that checks for unavailable objects and, if it finds that an object is available, changes the object status from unavailable to available.

filter

filter

A criterion used to refine the results of a search. Also, to apply a filter.

fixed-content data

fixed-content data

A digital asset ingested into HCP and preserved in its original form as the core part of an object. Once stored, fixed-content data cannot be modified.

full-copy distribution

full-copy distribution

A distribution method for erasure-coded protection where, after an object is ingested, full copies of the object data are distributed to the systems in the erasure coding topology and those full copies are later reduced to chunks.

G

garbage collection service

garbage collection service

The HCP service that deletes data and metadata left in the repository by incomplete operations, thereby freeing space for the storage of additional objects.

General node

General node

An HCP node that manages the objects that are added to HCP and can be used for object storage. Each storage node runs the complete HCP software (except the HCP search facility software).

geo-distributed erasure coding service

geo-distributed erasure coding service

The HCP service that reduces to chunks full copies of the data for objects subject to erasure coding and that restores chunks for objects to full copies of object data.

geo-protection

geo-protection

The maintenance of selected tenants and namespaces on two or more geographically separated HCP systems and management of objects in those namespaces across those systems. Geo-protection helps ensure that data is well-protected against the unavailability or catastrophic failure of a system.

GID

GID

POSIX group identifier.

group account

group account

A representation of an Active Directory group in HCP. A group account enables Active Directory users in the Active Directory group to access one or more HCP interfaces.

H

hard quota

hard quota

The total amount of storage available to the tenant for allocation to its namespaces or, in the context of an HCP namespace, the total amount of storage available for storing objects in the namespace.

HCP core software

HCP core software

The software, other than the Appliance Operating System, that’s installed on each HCP storage node to create an HCP system.

HCP Data Migrator (HCP-DM)

HCP Data Migrator (HCP-DM)

An HCP utility that can transfer data from one location to another, delete data from a location, and change object metadata in a namespace. Each location can be a local file system, an HCP namespace, a default namespace, or an HCP 2.x archive.

HCP file system (HCP-FS)

HCP file system (HCP-FS)

The HCP runtime component that represents each object in a namespace as a set of files. One of these files contains the object data. The others contain the object metadata.

HCP management API

HCP management API

A RESTful HTTP interface to a subset of the administrative functions of an HCP system. Using this API, you can manage tenants, namespaces, content classes, retention classes, and tenant-level user and group accounts.

HCP metadata query API

HCP metadata query API

See metadata query API.

HCP namespace

HCP namespace

A namespace that supports user authentication for data access through the REST, S3 compatible, HSwift, and CIFS namespace access protocols. HCP namespaces also support storage usage quotas, access control lists (HCP 5.0 and later), and versioning. An HCP system can have multiple HCP namespaces.

HCP node

HCP node

See node.

HCP S Series Node

HCP S Series Node

HCP Series Nodes serve as storage tiering platforms, known as S Series storage, for HCP systems. HCP uses the S Series Node Hitachi API for Amazon S3, which is compatible with Amazon® S3™, to write, retrieve, and otherwise manage objects in an S Series Node. A single HCP system can seamlessly tier data across multiple S Series Nodes, thereby enabling scalability in both capacity and performance.

HCP search facility

HCP search facility

One of the search facilities available for use with the HCP Search Console. This facility is integrated with HCP and works internally to perform searches and return results to the Search Console.

The HCP search facility is available only in HCP systems that included it before being upgraded from an earlier release.

HCP service

HCP service

See service.

HCP Setup

HCP Setup

The program you use to install, upgrade, and add nodes to an HCP system.

HCP software

HCP software

The HCP software that runs on each storage node in the HCP system. The HCP software does not include the Appliance Operating System.

HCP tenant

HCP tenant

An administrative entity created on HCP for the purpose of owning and managing namespaces.

HCP user account

HCP user account

A set of credentials that gives a user access to one or more of the System Management Console, the Tenant Management Console, the HCP management API, the HCP Search Console, namespace content through the namespace access protocols, the metadata query API, and HCP Data Migrator.

The HCP user account is used to generate Temporary Authentication tokens, see Temporary Authentication, and authenticate users through Local Authentication, see Local Authentication.

The HCP user account cannot be accessed, or be made the owner of a container through the HSwift API.

HCP VM system

HCP VM system

An HCP VM in which the nodes are virtual machines running in a KVM or VMware vSphere environment.

HCP

Hitachi Content Platform (HCP)

A distributed object-based storage system designed to support large, growing repositories of fixed-content data. HCP provides a single scalable environment that can be used for archiving, business continuity, content depots, disaster recovery, e-discovery, and other services. With its support for multitenancy, HCP securely segregates data among various constituents in a shared infrastructure. Clients can use a variety of industry-standard protocols and various HCP-specific interfaces to access and manipulate objects in an HCP repository.

HDDS search facility

HDDS search facility

One of the search facilities available for use with the HCP Search Console. This facility interacts with Hitachi Data Discovery Suite. To use this facility, HDDS needs to be installed and configured. HDDS is a separate product from HCP.

hidden master

hidden master

A DNS configuration wherein the IP addresses of the master name servers for a given network are not publicly visible and client access to HCP over the network is allowed only through one or more specified downstream DNS servers.

highest-numbered node

highest-numbered node

The HCP node with the highest-numbered fourth octet in its back-end IP address.

Hitachi API for Amazon S3

Hitachi API for Amazon S3

One of the namespace access protocols supported by HCP. Hitachi API for Amazon S3 is a RESTful, HTTP-based API that is compatible with Amazon S3. Using this S3 compatible API, users and applications can create and manage buckets and bucket contents.

Hitachi Content Archive Platform (HCAP)

Hitachi Content Archive Platform (HCAP)

The predecessor to Hitachi Content Platform.

Hitachi Content Platform (HCP)

Hitachi Content Platform (HCP)

A distributed object-based storage system designed to support large, growing repositories of fixed-content data. HCP provides a single scalable environment that can be used for archiving, business continuity, content depots, disaster recovery, e-discovery, and other services. With its support for multitenancy, HCP securely segregates data among various constituents in a shared infrastructure. Clients can use a variety of industry-standard protocols and HCP-specific interfaces to access and manipulate objects in an HCP repository.

hitachi data discovery suite (HDDS)

Hitachi Data Discovery Suite (HDDS)

A Hitachi product that enables federated searches across multiple HCP systems and other supported systems.

hold

hold

A condition that prevents an object from being deleted by any means and from having its metadata modified, regardless of its retention setting, until it is explicitly released.

host

host

A physical computer on which virtual machines are installed and run.

hotfix

hotfix

An update to an HCP system that resolves a particular problem. Hotfixes are designed to resolve customer problems on a one-off basis.

HSwift account

HSwift account

An HSwift account is the representation of an HCP tenant, see HCP tenant, or Keystone HCP tenant, see Keystone HCP tenant, on HSwift. The HSwift account holds containers, the way an HCP tenant holds namespaces. Unlike and HCP tenant, HSwift account have no owner unless assigned one outside of the HSwift API.

HSwift API

HSwift API

One of the namespace access protocols supported by HCP. HSwift is a RESTful, HTTP-based API that is compatible with OpenStack. Using HSwift, users and applications can create and manage containers and container contents.

HTTP

HTTP

HyperText Transfer Protocol. One of the namespace access protocols supported by HCP. In the context of namespace access, the HTTP protocol is also called the REST API.

HCP also uses HTTP for:

oClient communication with the System Management

oClient communication with the Tenant Management

oClient communication with the Search Consoles

oClient access through the HCP management API

oHCP-DM access to namespace content

oHCP Search Console communication with Console clients

oAccess to namespace content through the metadata query API.

HTTPS

HTTPS

HTTP with SSL security. See HTTP and SSL.

I

inbound link

inbound link

An active/passive replication link from the perspective of the replica for the link.

index setting

index setting

The property of an object that determines whether the metadata query engine indexes the custom metadata associated with the object.

index

index

An index of the objects in namespaces that is used to support object-based queries and search operations.

For object-based queries, HCP builds this index from object metadata, including custom metadata and ACLs.

For search operations, each of the two search facilities, the metadata query engine and the HDDS search facility, creates and maintains its own separate index. The metadata query engine builds this index from object metadata, including custom metadata and ACLs. The HDDS search facility index is built and maintained by HDDS.

indexing policy

indexing policy

The HCP policy that determines whether an object is included in the search index.

installation SSH key

installation SSH key

The SSH key required to log into an HCP node from a laptop computer for the purpose of performing a fresh installation of HCP.

Integrated Windows authentication

Integrated Windows authentication

A Microsoft authentication mechanism that enables clients to authenticate to a web server by using the Windows user information currently cached on the client computer, thereby removing the need to explicitly log in.

IP mode

IP mode

A front-end network property that determines whether the network can be configured to use IPv4 addresses, IPv6 addresses, or both.

item

item

An HCP or HCAP object, a file in a local file system, a symbolic link, or a directory.

J

job

job

A copy, delete, or metadata operation that’s in progress or the configuration and status information for any given copy, delete, or metadata operation. Jobs can be saved for later access and use.

JOSS

JOSS

Java OpenStack Storage. A Java client for the OpenStack Storage content REST interface.

JSON

JSON

JavaScript Object Notation. A language-independent format for encoding data in the form of name/value pairs.

K

kernel

kernel

The core component of a computer operating system. The kernel provides the resource-management services that bridge the gap between the computer hardware and software.

Keystone HCP tenant

Keystone HCP tenant

The Keystone HCP tenant is a tenant on Keystone that mirrors your HCP tenant, see HCP tenant. The Keystone HCP tenant must have an identical name to your HCP tenant (case sensitivity and spacing included) in order for the HCP tenant to be registered on Keystone.

On HCP, Keystone HCP tenants are represented as HCP tenants. On the HSwift API, Keystone HCP tenants are represented as the HSwift account HSwift account.

Keystone services tenant

Keystone services tenant

The Keystone services tenant is an automatically generated Keystone tenant that is used to authenticate and catalog the different services registered with Keystone. The users on the Keystone service tenant represent the service itself instead of an actual user. See, Keystone services user.

Keystone services user

Keystone services user

The Keystone services user is added to the Keystone services user tenant to register HCP with Keystone. The Keystone services user itself does not represent an actual user, but rather services that are registered and can be authenticated with Keystone. See, Keystone services tenant.

Keystone

Keystone

Keystone is an OpenStack identity service that uses token-based user authentication. Keystone generates authentication tokens with a predetermined expiration timer that are used to identify users trying to store and manage containers and objects. The service can be configured to integrate with HCP.

L

LDAP

LDAP

Lightweight Directory Access Protocol. The application protocol used to request directory services from Active Directory.

Local Authentication

Local Authentication

Authentication wherein HCP internally checks the validity of the specified username and password.

local storage volume

local storage volume

A logical volume on storage that’s managed by HCP.

lockdown

lockdown

The condition of an HCP node wherein login requires the use of SSH with specific keys.

logical unit number (LUN)

logical unit number (LUN)

A number used to identify a logical unit, which is a device addressed by the Fibre Channel.

logical volume

logical volume

A logical unit of storage that maps to the physical storage managed by a node. The physical storage can be storage that's managed by HCP or storage on an external NFS device.

M

management API

management API

See HCP management API.

metadata query API

metadata query API

A RESTful HTTP interface that lets you search HCP for objects that meet specified metadata-based or operation-based criteria. With this API, you can search not only for objects currently in the repository but also for information about objects that are no longer in the repository.

Metadata Query Engine Console

Metadata Query Engine Console

The web application that provides interactive access to the HCP search functionality provided by the metadata query engine.

metadata query engine

metadata query engine

One of the search facilities available for use with HCP. The metadata query engine works internally to perform searches and return results either through the metadata query API or to the HCP Metadata Query Engine Console (also known as the HCP Search Console).

metadata

metadata

System-generated and user-supplied information about an object. Metadata is stored as an integral part of the object it describes, thereby making the object self-describing.

metadata-only object

metadata-only object

An object for which the HCP system stores metadata but no data. The data for a metadata-only object is always stored on at least one other system.

metadirectory

metadirectory

A directory in the HCP namespace metadata directory or the default namespace fcfs_metadata directory hierarchy. Metadirectories contain metafiles.

metafile

metafile

A file containing metadata about an object. Metafiles enable file-system access to portions of the object metadata.

migration service

migration service

The HCP service that migrates data off selected storage nodes in an HCP RAIN system or selected storage arrays in an HCP SAIN system in preparation for retiring those devices.

mtime

mtime

In POSIX file systems, metadata that specifies the date and time of the last change to the data for an object. In HCP, POSIX metadata that initially specifies the date and time at which an object was ingested. Because you cannot change the content of an object, HCP does not change the mtime value for objects.

Users and applications can change this metadata, thereby causing it to no longer reflect the actual ingest time.

multipart object

multipart object

An object created by means of a multipart upload.

multipart upload

multipart upload

The process of writing the data for an object to HCP in multiple parts. Multipart upload is supported only by the Hitachi API for Amazon S3.

multipathing

multipathing

In SAIN systems, multiple means of access to a logical volume from a single node.

N

name server

name server

A server that’s part of a domain name system.

namespace access protocol

namespace access protocol

A protocol that can be used to transfer data to and from namespaces in an HCP system. HCP supports the REST, WebDAV, CIFS, NFS, and SMTP protocols for access to HCP namespaces and the default namespace. For access to HCP namespaces, HCP also supports the S3 compatible and HSwift APIs. For access to the default namespace, HCP also supports the NDMP protocol.

namespace profile

namespace profile

A named set of configuration information that identifies a namespace or archive and associates it with parameters to be used in copy or delete operations.

namespace quota

namespace quota

The number of namespaces HCP reserves for an HCP tenant out of the total number of namespaces the system can have.

namespace


namespace

A logical partition of the objects stored in an HCP system. A namespace consists of a grouping of objects such that the objects in one namespace are not visible in any other namespace. Namespaces are configured independently of each other and, therefore, can have different properties.

© 2015, 2019 Hitachi Vantara Corporation. All rights reserved.

NDMP

NDMP

Network Data Management Protocol. The namespace access protocol HCP supports for backing up and restoring objects in the default namespace.

network address translation (NAT)

network address translation (NAT)

The translation of a set of IP addresses used within a local area network to a different set of IP addresses used within another network.

network alias

network alias

A named pointer to a network. You can select a network alias for any purpose for which you can select a network.

network file system

network file system

One of the namespace access protocols supported by HCP. NFS lets clients access files on a remote computer as if the files were part of the local file system.

network interface controller (NIC)

network interface controller (NIC)

A hardware interface that connects the computer to its appropriate network. NICs can be physical (pNIC) or virtual (vNIC).

network

network

In an HCP system that supports virtual networking, a named network configuration that identifies a unique subnet and specifies IP addresses for none, some, or all of the nodes in the system.

node

node

A server or virtual machine running HCP-VM software. Two nodes are networked together to form an HCP-VM system.

O

object-based query

object-based query

In the metadata query API, a query that searches for objects based on object metadata. This includes both system metadata and the content of custom metadata and ACLs. The query criteria can also include the object location (That is, the namespace and/or directory that contains the object).

Object-based queries searches only for objects that currently exist in the repository. For objects with multiple versions, object-based queries return only the current version.

object

object

An exact digital representation of data as it existed before it was ingested into HCP, together with the system and custom metadata that describes that data. Objects can also include ACLs that give users and groups permission to perform certain operations on the object.

An object is handled as a single unit by all transactions, services, and internal processes, including shredding, indexing, versioning, and replication.

offline upgrade

offline upgrade

An upgrade of an HCP system during which the system is automatically shut down and then restarted when the upgrade is complete. During an offline upgrade, the system is not accessible to users and applications.

online upgrade

online upgrade

An upgrade of an HCP system during which the system remains online and accessible to users and applications.

open virtualization format (OVF)

open virtualization format (OVF)

Standard file style for packaging and distributing virtual software.

operation record

operation record

A record of a create, delete, purge, prune or disposition operation. The record identifies the object involved, the type of operation, and the time at which the operation occurred and also contains system metadata for the object. HCP updates the applicable creation record when object metadata changes.

operation-based query

operation-based query

In the metadata query API, a query that searches not only for objects currently in the repository but also for information about objects that have been deleted by a user or application or delete through disposition, purged, or pruned. For namespaces that support versioning, operation-based queries can return both current and old versions of objects.

Criteria for operation-based queries can include object status (for examples, created or deleted), change time, and location (that is, the namespace and/or directory that contains the object).

outbound link

outbound link

An active/passive replication link from the perspective of the primary system for the link.

P

permission

permission

One of these:

oIn POSIX permissions, the ability granted to the owner, the members of a group, or other users to access an object, directory, or symbolic link. A POSIX permission can be read, write, or execute.

oIn a data access permission mask, the condition of allowing a specific type of operation to be performed in a namespace.

oIn a tenant-level user account, the granted ability to perform a specific type of operation in a given namespace.

oIn an ACL associated with a bucket or an object, the granted ability to perform a specific type of operation on the bucket or object.

oThe granted ability to access the HCP System Management Console, Tenant Management, or HCP Search Console and to perform a specific activity or set of activities in that Console. Permissions of this type are granted by roles associated with the user account.

ping

ping

A utility that tests whether an IP address is accessible on the network by requesting a response from it. Also, to use the ping utility.

policy

policy

One or more settings that influence how transactions, services, and internal processes work on objects. Such a setting can be a property of an object, such as retention, or a property of a namespace, such as versioning.

POSIX

POSIX

Portable Operating System Interface for UNIX. A set of standards that define an application programming interface (API) for software designed to run under heterogeneous operating systems. HCP-FS is a POSIX-compliant file system, with minor variations.

primary metadata

primary metadata

Metadata HCP stores for an object when it’s first added to HCP.

primary system

primary system

For an active/passive replication link, the HCP system from which the replication service copies objects and other information to the replica during normal replication.

privileged delete

privileged delete

A delete operation that works on an object regardless of whether the object is under retention, except if the object is on hold. This operation is available only to users and applications with explicit permission to perform it.

Privileged purge operations work only in namespace in enterprise mode.

privileged purge

privileged purge

A purge operation that works on an object regardless of whether the object is under retention, except if the object is on hold. This operation is available only to users and applications with explicit permission to perform it.

Privileged purge operations work only in namespace in enterprise mode.

profile user

profile user

A user account specified in a namespace profile.

protection optimization

protocol optimization

Improves the performance of namespace access protocols, which, in turn, increases the ingest rate when ingesting objects on a system with a high object count.

protection service

protection service

The HCP service that ensures the stability of the repository by maintaining a set level of data redundancy within each namespace, as specified by the service plan for the namespace.

protection set

protection set

A group of DPL storage nodes in which HCP tries to store all the copies of a given object.

pruning

pruning

See version pruning.

purge

purge

The operation that deletes all versions of an object.

Q

query API

query API

See metadata query API.

query

query

A request submitted to HCP to return metadata for objects or operation records that satisfy a specified set of criteria. Also, to submit such a request.

R

RADIUS

RADIUS

Remote Authentication Dial-In User Service. A protocol for authenticating credentials that authorize access to an IP network.

recognized Active Directory user account

recognized Active Directory user account

An Active Directory user account for a user that belongs to one or more Active Directory groups for which corresponding group accounts are defined in HCP.

recovery

recovery

See data recovery.

redundant array of independant nodes (RAIN)

redundant array of independant nodes (RAIN)

An HCP system configuration in which the nodes use internal or direct-attached storage.

region

region

An HCP-internal logical grouping of objects and certain types of system data (such as system log messages and usage statistics). HCP uses regions to distribute object metadata and system data among the storage nodes in the system.

remote authentication

remote authentication

Authentication wherein HCP uses a remote service to check the validity of the specified username and password.

replica

replica

For an active/passive link, the HCP system to which the replication service copies objects and other information from the primary system during normal replication.

replication link

replication link

A configurable, secure trust relationship between two HCP systems that determines what is replicated between the systems and how data is transmitted between the systems.

replication service

replication service

The HCP service that performs replication.

replication

replication

A process by which selected tenants and namespaces are maintained on two or more HCP systems and the objects in those namespaces are managed across those systems. Typically, the systems involved are in separate geographic locations and are connected by a high-speed wide area network. This arrangement provides geographically distributed data protection (called geo-protection).

replication link

replication link

A configurable, secure trust relationship between two HCP systems that determines what is replicated between the systems and how data is transmitted between the systems.

replication service

replication service

The HCP service that performs replication.

replication topology

replication topology

A configuration of HCP systems that are related to each other through replication links. Typically, the systems in a replication topology are in separate geographic locations and are connected by a high-speed wide area network.

replication verification service

replication verification service

The HCP service that identifies and tries to replicate objects that the replication service missed replicating or was unable to replicate.

repository

repository

The aggregate of the namespaces defined for an HCP system.

resource path line

resource path line

The resource path line for an HSwift request specifies the operation target, whether it be an HSwift account, container, or object.

resource

resource

An entity that you can manage independently in the HCP management API. Examples of resources are tenants and namespaces.

REST API

REST API

One of the namespace access protocols supported by HCP. The REST API is also called the HTTP protocol.

REST

REST

Representational State Transfer. A software architectural style that defines a set of rules (called constraints) for client/server communication. In a REST architecture:

Resources (where a resource can be any coherent and meaningful concept) must be uniquely addressable.

Representations of resources (for example, in XML format) are transferred between clients and servers. Each representation communicates the current or intended state of a resource.

Clients communicate with servers through a uniform interface (that is, a set of methods that resources respond to) such as HTTP.

retention class

retention class

A named retention setting. The value of a retention class can be a duration, Deletion Allowed, Deletion Prohibited, or Initial Unspecified.

retention hold

retention hold

See hold.

retention mode

retention mode

A namespace property that affects which operations are allowed on objects under retention. A namespace can be in either of two retention modes: compliance or enterprise.

retention period

retention period

The period of time during which an object cannot be deleted (except by means of a privileged delete).

retention policy

retention policy

The HCP policy that determine how an object responds to deletion requests.

retention setting

retention setting

The property that determines the retention period for an object.

role

role

A named collection of permissions that can be associated with an HCP user account, where each permission allows the user to perform some specific interaction or set of interactions with the HCP System Management Console, the Tenant Management Console, the HCP management API, the metadata query API, or, for default namespaces only, the HCP Search Console. Roles generally correspond to job functions.

root SSH key

root SSH key

The SSH key required to log into an HCP node as the root user from a laptop computer.

running storage

running storage

Storage on continuously spinning disks.

S

SAN-attached array of independent nodes (SAIN)

SAN-attached array of independent nodes (SAIN)

An HCP system configuration in which the nodes use SAN-attached storage.

scavenging service

scavenging service

The HCP service that ensures that objects in the HCP repository have valid metadata.

search console

search console

The web application that provides interactive access to HCP search functionality. When the Search console uses the hcp metadata query engine for search functionality, it is called the Metadata Query Engine Console.

search facility

search facility

An interface between the HCP Search console and the search functionality provided by the metadata query engine or HDDS. Only one search facility can be selected for use with the Search Console at any given time.

search node

search node

An HCP node that runs the HCP search facility software and stores the search index that’s built and maintained by that facility.

search results

search results

A list of objects that HCP or HDDS returns in response to a query. Search results show metadata for the listed objects.

search

search

The process of submitting a query and receiving metadata about the objects that satisfy the query criteria.

secondary metadata

secondary metadata

The metadata stored with each copy of an object. Secondary metadata provides the redundancy that enables the protection and scavenging services to ensure object availability and integrity.

secret key

secret key

The MD5 hash of the password for an HCP user account.

secure shell

secure shell

A network protocol that lets you log into and execute commands in a remote computer. SSH uses encrypted keys for computer and user authentication.

secure sockets layer

secure sockets layer

Secure Sockets Layer. A key-based Internet protocol for transmitting documents through an encrypted link.

service plan

service plan

A named specification of an HCP service behavior that determines how HCP manages objects in a namespace. Service plans enable you to tailor service activity to specific namespace usage patterns or properties.

service point

service point

A tenant that serves as the point of access to HCP in an HSwift API request.

service SSH key

service SSH key

The SSH key required to log into an HCP node as the service user from a laptop computer.

service

service

A background process that performs a specific function that contributes to the continuous tuning of the HCP system. In particular, services are responsible for optimizing the use of system resources and maintaining the integrity and availability of the data stored in the HCP repository.

shred setting

shred setting

The property that determines whether an object will be shredded or simply removed when it’s deleted from HCP.

shredded policy

shredded policy

The HCP policy that determines whether an object is shredded when it’s deleted.

shredded service

shredded service

The HCP service that shreds deleted objects that are marked for shredding.

shredding

shredding

The process of deleting an object and overwriting the locations where all its copies were stored in such a way that none of its data or metadata can be reconstructed. Also called secure deletion.

signature

signature

A value calculated using specific elements of a Hitachi API for Amazon S3 request, including the secret key of the requester and a date and time.

simple network management protocol (SNMP)

simple network management protocol (SNMP)

A protocol HCP uses to facilitate monitoring and management of the system through an external interface.

simple search

simple search

A type of search available in the HCP Search Console. A simple search lets you specify only text-based search criteria.

single sign-on

single sign-on

In a Windows environment, the use of an already authenticated Active Directory user account to access the System Management Console, Tenant Management Console, HCP Search Console, or Namespace Browser without the need to explicitly log in.

 

SMTP

SMTP

Simple Mail Transfer Protocol. The namespace access protocol HCP uses to receive and store email data directly from email servers.

SNMP trap

SNMP trap

A type of event for which each occurrence causes SNMP to send notification to specified IP addresses. SNMP traps are set in management information base (MIB) files.

S Series Node storage

S Series Node storage

See HCP S Series Node.

soft quota

soft quota

The percentage point at which HCP notifies a tenant that allocated storage space is being used up. For a tenant, the soft quota measures the space used in all the namespaces the tenant owns relative to the hard quota for that tenant. For a namespace, the soft quota measures the space used in only that namespace relative to the hard quota for that namespace.

spindown storage

spindown storage

Storage on disks that can be spun down and spun up as needed.

SPNEGO

SPNEGO

Simple and Protected GSSAPI Negotiation. A protocol used for client authentication against a remote server.

SSH

SSH

See secure shell.

SSL server certificate

SSL server certificate

A file containing cryptographic keys and signatures. When used with the HTTP protocol, an SSL server certificate helps verify that the web site holding the certificate is authentic. An SSL server certificate also helps protect data sent to or from that site.

storage license

storage license

A storage license gives you access to a designated amount of your HCP system disk storage capacity. The license can be created for active or extended storage.

storage node

storage node

An HCP node that manages the objects that are added to HCP and can be used for object storage. Each storage node runs the complete HCP software (except the HCP search facility software).

storage tiering service

storage tiering service

The HCP service that moves object from running storage to spindown storage and from spindown storage to running storage according to rules in service plans.

structured search

structured search

A type of search available in the HCP Search Console. A structured search lets you specify multiple text- and/or metadata-based criteria.

subdomain

subdomain

A subset of the computers and devices in a domain.

Subject Common Name

Subject Common Name

The Common Name found in the subject of a SSL certificate. The Common Name must match the host name of the host providing the certificate.

switch

switch

A device used on a computer network to connect devices together.

syslog

syslog

A protocol used for forwarding log messages in an IP network.  HCP uses syslog to facilitate system monitoring through an external interface.

system management console

system management console

The system-specific web application that lets you monitor and manage HCP.

system metadata

system metadata

System-managed properties that describe the content of an object. System metadata includes policies, such as retention and data protection level, that influence how transactions, services, and internal processes affect the object.

system service tools

system service tools

A set of Python tools that let you act on all nodes in an HCP system with a single command.

systemwide permission mask

systemwide permission mask

The data access permission mask defined at the HCP system level. The systemwide permission mask applies across all tenants and namespaces.

T

tag

tag

An arbitrary text string associated with an HCP tenant or namespace. Tags can be used to group tenants or namespaces and to filter tenants or namespace lists.

tagged network

tagged network

A network that has a VLAN ID.

Temporary Authentication

Temporary Authentication

A command that requests an authorization token from HCP that is created from Base64 encoding of an HCP user account username and MD5 encoding of an HCP user account password.

tenant management console

tenant management console

The tenant-specific web application that lets you monitor and manage tenants and namespaces.

tenant

tenant

An administrative entity created for the purpose of owning and managing namespaces. Tenants typically correspond to customers or business units.

transaction log

transaction log

A record of all create, delete, purge, and disposition operations performed on objects in any namespace over a configurable length of time ending with the current time. Each operation is represented by an operation record.

trap

trap

See SNMP trap.

U

UID

UID

POSIX user ID.

unix

unix

Any UNIX-like operating system (such as UNIX itself or Linux).

untagged network

untagged network

A network with that does not have VLAN ID.

upstream DNS server

upstream DNS server

A DNS server to which HCP routes the outbound communications it initiates (for example, for sending log messages to syslog servers or for communicating with Active Directory).

user account

user account

A set of credentials that gives a user access to one or more of the System Management Console, Tenant Management Console, HCP management API, HCP Search Console, or namespace content through the namespace access protocols, metadata query API, HCP Data Migrator, and a given tenant and its namespaces.

user authentication

user authentication

The process of checking that the combination of a specified username and password is valid when a user tries to log into the System Management Console, Tenant Management Console, HCP Search Console, tries to access the HCP system through the management API, or tries to access a namespace.

V

version pruning

version pruning

The automatic deletion of previous versions of objects that are older than a specified amount of time.

versioning policy

versioning policy

The HCP policy that determines whether a namespace can store multiple versions of objects.

versioning

versioning

An optional namespace feature that enables the creation and management of multiple versions of an object.

virtual local area network (VLAN)

virtual local area network (VLAN)

A distinct broadcast domain that includes devices within different segments of a physical network.

virtual machine

virtual machine

A piece of software that emulates the functionality of a physical computer.

virtual networking

virtual networking

A technology that enables the overlay of multiple logical network configurations onto a single physical network.

VLAN ID

VLAN ID

An identifier that's attached to each packet routed to HCP over a particular network. This function is performed by the switches in the physical network.

VLAN

VLAN

See Virtual Local Area Network (VLAN).

vmNIC

vmNIC

A representation in VMware vSphere of one of the physical NICs on a host.

VMware ESXi

VMware ESXi

The underlying operating system for the VMware vSphere product.

VMware vCenter Server

VMware vCenter Server

A VMware product that allows you to manage multiple ESXi hosts and the virtual machines that they run.

volume

volume

See logical volume.

W

WADL

WADL

Web Application Description Language. An XML-based description language for HTTP-based web applications.

WebDAV

WebDAV

Web-based Distributed Authoring and Versioning. One of the namespace access protocols supported by HCP. WebDAV is an extension of HTTP.

whole-object protection

whole-object protection

A method of geo-protection where all the data for each object in a replicated namespace is maintained on each HCP system in a replication topology, except on systems where the object is on a metadata-only storage tier. Whole-object protection requires only two systems but, with more systems, offers protection against multiple concurrent system failures.

Windows workgroup

Windows workgroup

A named collection of computers on a LAN that share resources such as printers and file servers.

workgroup

workgroup

See Windows workgroup.

WORM

WORM

Write once, read many. A data storage property that protects the stored data from being modified or overwritten.

X

XML

XML

Extensible Markup Language. A standard for describing data content using structural tags called elements.

XPath

XPath

A language used to formulate expressions that navigate through and select elements and attributes in XML documents.

Z

zero-copy failover

zero-copy failover

The process of one node automatically taking over management of storage previously managed by another node that has become unavailable.

zone

zone

A set of IP addresses served by DNS.