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Hitachi Vantara Knowledge

Clusters and server farms

The key differences between a cluster and a server farm are the behavior when a failure occurs, ease of management, and scalability of operations:

  • A cluster allows an EVS to be automatically migrated among cluster nodes in the event of a failure, and management of all nodes in the cluster is centralized. The use of a single namespace allows clients to mount a single network resource, while having the actual storage virtualized among different devices in the cluster.
  • A server farm allows an EVS to be migrated manually among servers in the server farm, but this is a manual process, and it does not happen automatically in the event of a failure. All servers in the server farm may be managed by a single NAS Manager, but each server must be managed as an independent unit.

Clusters versus server farms

The following table distinguishes the properties of a cluster and a server farm:

Property Cluster Server farm
Can belong to a server farm Yes No
EVS migration under server failure Automatic Manual
NVRAM mirroring between servers Yes No
Maximum number of storage servers Depends on several factors. See Maximum number of nodes supported for more information. No explicit restriction on the number of servers; however, a NAS Manager can manage only eight quorum devices and server farm planning should be adjusted accordingly.
Shared NAS Manager For central management; cluster quorum For central management; EVS migration
Storage Pools Yes No
Common Storage Access Yes Yes

 

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