Host modes and host mode options for host groups and iSCSI targets
Host modes for host groups
The following table lists the host modes that are available for use on your storage system. Carefully review and determine which host modes you will need to use when configuring your system and observe the cautions concerning using certain host modes. Host modes and host mode options must be set on the port before the host is connected. If you change host modes or host mode options after the host is connected, the host (server) will not recognize it.
Host mode |
When to select this mode |
00 Standard |
When registering Red Hat Linux server hosts or IRIX server hosts in the host group1 |
01 (Deprecated) VMware |
When registering VMware server hosts in the host group1, 2 |
03 HP |
When registering HP-UX server hosts in the host group |
05 OpenVMS |
When registering OpenVMS server hosts in the host group |
07 Tru64 |
When registering Tru64 server hosts in the host group |
09 Solaris |
When registering Solaris server hosts in the host group |
0A NetWare |
When registering NetWare server hosts in the host group |
0C (Deprecated) Windows |
When registering Windows server hosts in the host group2, 3 |
0F AIX |
When registering AIX server hosts in the host group |
21 VMware Extension |
When registering VMware server hosts in the host group. If the virtual host on VMware recognizes LUs by the Raw Device Mapping (RDM) method, set the host mode related to OS of the virtual host.1 Example: If a LUN/LDEV is formatted as VMFS (where virtual machines and their VMDK’s usually reside), it should be set with HMO 21. However, if a LUN/LDEV is formatted as a specific file system format (for example, NTFS) and has application requirements to be presented directly to a virtual machine as an RDM, it should be set to the HMO specific to that OS/filesystem (e.g., such as HMO 2C for Windows). A common example of VM’s with this mix would be: C: drive – OS VMDK on VMFS D: drive – RDM for application data In this example, 2 different Host Groups should be created for a single host with different HMO and LUN’s assigned. |
2C Windows Extension |
When registering Windows server hosts in the host group.1 |
Notes:
|
Host mode options
The following table lists the host mode options (HMOs) that are available to use for configuring hosts on your storage system.
No. |
Host mode option |
When to select this option |
2 |
VERITAS Database Edition/ Advanced Cluster Oracle Solaris Cluster (Sun Cluster) |
When VERITAS Database Edition/Advanced Cluster for Oracle Real Application Clusters or VERITAS Cluster Server 4.0 or later (I/O fencing function) is used. When Oracle Solaris Cluster (Sun Cluster) is used. |
6 |
TPRLO |
When all of the following conditions are satisfied:
|
7 |
Automatic recognition function of LUN |
When all of the following conditions are satisfied:
|
12 |
No display for ghost LUN |
When all of the following conditions are satisfied:
|
13 |
SIM report at link failure1 |
When you want to be informed by SIM (service information message) that the number of link failures detected between ports exceeds the threshold. |
14 |
HP TruCluster with TrueCopy function |
When all of the following conditions are satisfied:
|
15 |
HACMP/PowerHA® |
When all of the following conditions are satisfied:
* HACMP 4.5 version 4.5.0.13 or later, HACMP 5.1 version 5.1.0.4 or later, or HACMP 5.2 or later. |
22 |
Veritas Cluster Server Oracle Solaris Cluster (Sun Cluster) |
When Veritas Cluster Server is used. When Oracle Solaris Cluster (Sun Cluster) is used. |
25 |
Support SPC-3 behavior on Persistent Reservation |
When one of the following conditions are satisfied:
|
33 |
Set/Report Device Identifier enable |
When all of the following conditions are satisfied:
|
39 |
Change the nexus specified in the SCSI Target Reset |
When you want to control the following ranges per host group when receiving Target Reset:
|
40 |
V-VOL expansion |
When all of the following conditions are satisfied:
|
43 |
Queue Full Response |
When the command queue is full in your storage system connecting with the HP-UX host, and if you want to respond
|
51 |
Round Trip Set Up Option3 |
If you want to adjust the response time of the host I/O, for example when the distance between MCU and RCU of the TrueCopy (or global-active device) pair is long (approximately 100 kilometers) and Point-to-Point topology is used. |
54 |
(VAAI) Support Option for the EXTENDED COPY command |
When the VAAI (vStorage API for Array Integration) function of VMware ESX/ESXi 4.1 or later is used. |
63 |
(VAAI) Support Option for vStorage APIs based on T10 standards |
When you connect the storage system to VMware ESXi 5.0 or later and use the VAAI function for T10. Use a combination of this host mode option and host mode option 54. |
67 |
Change of the ED_TOV value |
When using the FCAL topology and direct connection in the OPEN Fibre Channel Port configuration. |
68 |
Support Page Reclamation for Linux |
When using the Page Reclamation function from the environment which is being connected to the Linux host. |
71 |
Change the Unit Attention for Blocked Pool-VOLs |
When you want to change the unit attention (UA) from
|
73 |
Support Option for WS2012 |
When using following functions provided by Windows Server 2012 (WS2012) or later from the environment which is being connected to the WS2012 or later.
|
78 |
The non-preferred path option |
When all of following conditions are satisfied:
|
80 |
Multi Text OFF |
By using the iSCSI interface, if the storage system connects with the host of which OS is not supported of the Multi Text function. For instance, connecting the storage system and the host of RHEL5.0 which does not support the Multi Text-function. |
81 |
NOP-In Suppress Mode |
In the environment by iSCSI connection, the delay replying of the Delayed Acknowledgment function which is located on the upper layer is restrained by sending NOP-IN of executing of sense commands such as Inquiry, Test unit ready, or Mode sense. However, select this option when connecting the storage system and the host which is not necessary of the NOP-IN sending. However, when connecting the storage system and the host which does not need of the NOP-IN sending, select this option. For instance:
|
82 |
Discovery CHAP Mode |
Select this option when the CHAP authentication is performed at the time of the discovery login In the iSCSI connection environment. For instance: When the CHAP authentication is performed at the time of the discovery login in the iSCSI environment of the VMware host and storage system |
83 |
Report iSCSI Full Portal List Mode |
When configuring alternate paths in the environment of connecting the VMware host and storage system: If waiting of replying of the target information from the host option mode 83 enabled port other than ports of discovery login, select this host mode option. Apply this host mode option when all of the following conditions are met:
|
88 |
Nondisruptive migration with HP-UX hosts |
When converging multiple host-target ports used in the migration source storage system on the migration target storage system, and enable LUN path definition from a host group belonging to a virtual storage machine to an LDEV defined in a different virtual storage machine.
Note:
|
91 |
Disable I/O wait for OpenStack Option |
When manually creating host groups (for Fibre Channel) or iSCSI targets (for iSCSI) that are used as the I/O data paths for OpenStack. |
96 |
Change the nexus specified in the SCSI Logical Unit Reset |
When you want to control the following ranges per host group when receiving LU Reset:
|
102 |
(GAD) Standard Inquiry Expansion for Hitachi Command Suite |
When all of the following conditions are satisfied:
|
105 |
Task Set Full response in the event of I/O overload |
When all of following conditions are satisfied:
|
110 |
ODX support for WS2012 |
When ODX (Offload Data Transfer) provided by Windows Server 2012 or later is used, in the environment with which the WS2012 or later host connects. |
113 |
iSCSI CHAP Authentication Log4 |
When the result of the CHAP authentication is output to the audit log (DKC). |
114 |
The automatic asynchronous reclamation on ESXi 6.5 or later |
When connecting to VMware ESXi 6.5 or later, and when using the zero data page reclamation function which is performed automatically if files on the VMFS (Virtual Machine File System) are deleted. Use a combination of this host mode option and host mode option 63. |
Notes:
|