HP StorageWorks Enterprise File Services WAN Accelerator Deployment Guide (November 2005)

34 4 - OUT-OF-PATH NETWORK DEPLOYMENTS
Typically, in an out-of-path deployment, the client-side HP EFS WAN
Accelerator is configured as an in-path device, and the server-side HP EFS
WAN Accelerator is configured as an out-of-path device.
Figure 4-1. Physical Out-of-Path Deployment
Out-of-Path, Failover Deployment
An out-of-path, failover deployment serves networks where an in-path
deployment is not an option. This deployment is cost effective, simple to
manage, and provides redundancy.
In an out-of-path, failover deployment, two HP EFS WAN Accelerators are
deployed. When both HP EFS WAN Accelerators are functioning properly, the
connections traverse the master appliance. If the master HP EFS WAN
Accelerator fails, subsequent connections traverse the backup HP EFS WAN
Accelerator.
When the master HP EFS WAN Accelerator is restored, the next connection
traverses the master HP EFS WAN Accelerator. If both HP EFS WAN
Accelerators fail, the connection is passed through unoptimized to the server.