Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 73)

ServerIron ADX Advanced Server Load Balancing Guide 61

53-1002435-01

Other TCS options

Setting the cache server weight

You can assign a performance weight to each server. Servers assigned a larger or higher weight

receive a larger percentage of connections.

To set the weight for cache server1 to 5 from the default value of 1, enter the following commands.

ServerIronADX(config)# server cache-name server1

ServerIronADX(config-rs-server1)# weight 5

Syntax: weight <server-weight>

Both the <server-weight> variable may have any value between 1 to 65000. The default value is 1.

Enabling FastCache

By default, the ServerIron ADX uses cache responses to client requests as a means to assess the

health of the cache server. However, in an asymmetric topology where the cache server uses a path

to the client that does not pass through the ServerIron ADX, the ServerIron ADX does not observe

the return traffic. As a result, the ServerIron ADX concludes that the cache server has failed even

though the server might still be healthy.

When the ServerIron ADX concludes that a cache server is unavailable, the ServerIron ADX stops

sending client requests to the cache server. You can override this behavior by enabling the

FastCache feature. The FastCache feature configures the ServerIron ADX to continue sending client

requests to a cache server even if the ServerIron ADX does not see responses from the server.

To enable FastCache, enter commands such as the following.

ServerIronADX(config)# server cache-name server1

ServerIronADX(config-rs-server1)# asymmetric

Syntax: asymmetric

Enabling remote cache

The configuration examples in “Enabling remote cache” on page 61 assume that Proxy ARP is

enabled on the router that connects the ServerIron ADX to the cache servers. When Proxy ARP is

enabled on the router, the router informs the ServerIron ADX that it can respond on behalf of the

cache server. The ServerIron ADX uses ARP requests as part of the keepalive health checking

mechanism, so Proxy ARP enables the keepalive health checking mechanism to function.

If Proxy ARP is disabled on the router, the keepalive health checking mechanism believes the cache

server cannot be reached, and does not mark the server ACTIVE or direct request to the cache

server.

You can enable the ServerIron ADX to overcome the limitation posed by the absence of Proxy ARP

by enabling the Remote Cache feature for the cache server. To do this, enter commands such as

the following.

ServerIronADX(config)# server cache-name C1

ServerIronADX(config-rs-C1)# remote-cache

Syntax: [no] remote-cache

This example enables Remote Cache on cache server C1. With Remote Cache enabled, the

ServerIron ADX can perform health checks on the cache server, even though Proxy ARP is disabled

on the router connecting the ServerIron ADX to the cache server.

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