HP StorageWorks Enterprise File Services WAN Accelerator 3.0.4 deployment guide (AG421-96001, March 2007)

HP STORAGEWORKS ENTERPRISE FILE SERVICES WAN ACCELERATOR DEPLOYMENT GUIDE 47
5 - CONNECTION FORWARDING
If one of the neighbor HP EFS WAN Accelerators reaches its optimization capacity
limit, that HP EFS WAN Accelerator will not accept new connections, but it redirects
packets to other neighbors for optimization.
One-to-One Failover Deployment
To ensure optimization in the event of a failure, a backup HP EFS WAN Accelerator
can be added to each neighbor HP EFS WAN Accelerator in a one-to-one failover
configuration.
In Figure 5-2 there are two HP EFS WAN Accelerators on each server-side path that
are configured in a one-to-one failover mode. Each HP EFS WAN Accelerator must be
a neighbor of the master and backup HP EFS WAN Accelerators on the other paths.
Figure 5-2. One-to-One Failover Deployment
HP EFS WAN Accelerator-2 and HP EFS WAN Accelerator-2B are configured as
neighbors of HP EFS WAN Accelerator-1 which exchanges connection information
with both of them so that if either HP EFS WAN Accelerator-2 or HP EFS WAN
Accelerator-2B fails, the other redirects packets to HP EFS WAN Accelerator-1.
In Figure 5-2, packets from the server are redirected by HP EFS WAN Accelerator-2B
unless it fails in which case they are redirected by HP EFS WAN Accelerator-2.
As long as one of the two failover HP EFS WAN Accelerators on each path is up,
connections are intercepted. If the two HP EFS WAN Accelerators on the same path
fail, connections stop being intercepted and optimized.
Configuring Connection Forwarding
The following section describes the basic steps for configuring connection forwarding.
You can configure connection forwarding using the Management Console or the HP
EFS WAN Accelerator Command Line Interface (CLI).