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 93

8 - SERIAL CLUSTER AND

ASCADE DEPLOYMENTS

Cascade Deployment

Cascade configurations enable multi-site deployments where the server end-points are

located at intermediate sites and connections between the client and the server might

pass through intermediate HP EFS WAN Accelerators to reach their final destination.

HP EFS WAN Accelerators direct client-side HP EFS WAN Accelerator auto-

discovery packets to the correct HP EFS WAN Accelerator end-point.

Figure 8-3. Cascade Deployment

When the Client connects to a server in Site B, HP EFS WAN Accelerator1 and HP

EFS WAN Accelerator2 are optimizing the connection. When the Client connects to a

server in Site C, HP EFS WAN Accelerator1 and HP EFS WAN Accelerator3 are

optimizing the connection.

The following rules apply to cascade deployments:

 A cascade deployment can be created on either the client side or on the server

side.

 In a cascade deployment, only pass-through peering rules are used.

Peering Rules Peering rules define what to do when an HP EFS WAN Accelerator receives an auto-

discovery probe from another HP EFS WAN Accelerator.

In Figure 8-3, Server1 is on the same LAN as HP EFS WAN Accelerator2 so

connections from the client to Server1 should be optimized between HP EFS WAN

Accelerator1 and HP EFS WAN Accelerator2. Concurrently, Server2 is on the same

LAN as HP EFS WAN Accelerator3 and connections from the client to Server2 should

be optimized between HP EFS WAN Accelerator1 and HP EFS WAN Accelerator3.

To configure this example, you do not need any rules on HP EFS WAN Accelerator1

or HP EFS WAN Accelerator3; you need to add peering rules on HP EFS WAN

Accelerator2 to process normally connections going to Server1 and to pass all other

connections so that connections to Server2 are not optimized by HP EFS WAN

Accelerator2. You also need a default rule to pass through inner connections between

HP EFS WAN Accelerator1 and HP EFS WAN Accelerator3 (by default connection to

destination port 7800).

This example has the following parameters: