HP StorageWorks Enterprise File Services WAN Accelerator 3.0.4 Management Console user guide (AG421-96002, March 2007)

HP STORAGEWORKS EFS WAN ACCELERATOR MANAGEMENT CONSOLE USER GUIDE 73

2 CONFIGURING THE HP EFS

WAN A

CCELERATOR

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.