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

HP EFS WAN ACCELERATOR DEPLOYMENT GUIDE 111

10 - 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 10-3. 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 10-3, 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).