HP StorageWorks Enterprise File Services WAN Accelerator - Manual (Page 73)

HP S TORAGE W ORKS EFS WAN A CCELERATOR M ANAGEMENT C ONSOLE U SER G UIDE 73
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Enabling Failover
and Data Store
Synchronization You enable failover and automatic data store synchronization support in the Advanced
Networking - Failover Settings page.
Failover support ensures continued optimization if there is a failure with one of the HP
EFS WAN Accelerators. If the master HP EFS WAN Accelerator fails, the traffic is
automatically processed by the backup HP EFS WAN Accelerator.
Automatic data store synchronization replicates the data store from an active HP EFS
WAN Accelerator to a passive HP EFS WAN Accelerator without disrupting
operations. Data store synchronization ensures that a warm data store exists on the
backup HP EFS WAN Accelerator. With a warm data store, the backup HP EFS WAN
Accelerator can perform as optimally as its master when it is activated; that is, it
performs as if it has seen the data before and only sends new segments across the
WAN.
NOTE: Data is replicated only from the master HP EFS WAN Accelerator to the backup; not
vice versa.
NOTE: All operations occur in the background and do not disrupt operations on any of the
systems.
Enable data store synchronization if you have:
‹ Simple Redundancy. A network in which two HP EFS WAN Accelerators have
been deployed in a failover configuration.
‹ Router Redundancy. A network where there two or more routers at a remote site
and HP EFS WAN Accelerators are deployed behind each router for redundancy.
‹ Complex Router Redundancy. A network where serially connected HP EFS
WAN Accelerators containing multi-port cards that connect to multiple routers on
each side of the network.
‹ Virtual In-Path and Out-of-Path. An out-of-path deployment or a virtual in-
path deployment using WCCP, PBR, or a Layer-4 switch.
‹ Serial Cluster. A network where several HP EFS WAN Accelerators are
deployed back-to-back in an in-path configuration.
Enabling failover and data synchronization support is optional.