Technical data

64 Brocade ServerIron ADX Advanced Server Load Balancing Guide

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Other transparent cache switching options

Configuring the maximum connections for a cache server

You can limit the maximum number of connections supported on a server-by-server basis. By

setting a limit, you can avoid a condition where the capacity threshold of a cache server is

exceeded.

When a cache server reaches the maximum defined connection threshold, the ServerIron ADX

sends an SNMP trap. When the cache server reaches its maximum connection threshold, the

ServerIron ADX sends client requests to the Internet by default. Optionally, you can direct the

ServerIron ADX to send client requests to another available cache server that has not reached its

maximum connection threshold.

Up to 1,000,000 sessions are supported. This is the default.

To limit the connections to a maximum of 100,000 for cache server1 and 200,000 for server2 in

the network seen in Figure 9 on page 34, enter the following commands.

ServerIronADX(config)#server cache-name server1

ServerIronADX(config-rs-server1)#max-conn 100000

ServerIronADX(config-rs-server1)#server cache-name server2

ServerIronADX(config-rs-server2)#max-conn 200000

ServerIronADX(config-rs-server2)#end

ServerIronADX#write mem

Syntax: max-conn connections-supported

The connections-supported variable specifies the number of connections supported. Acceptable

values are from 1 to 2000000.

Redirecting client requests to an available cache server

When the limit specified in the max-conn command is reached for a cache server, the default

behavior is that the ServerIron ADX redirects any traffic intended for this cache server (according to

the allocated hash distribution) directly to the Internet.

Optionally, you can direct the ServerIron ADX to send client requests to another available cache

server in the same cache group that has not reached its maximum connection threshold without

changing the current hash distribution. Use the reselect-server-if-overloaded command under the

cache group configuration as shown in the following example.

ServerIronADX(config)#server cache-group 1

ServerIronADX(config-tc-1)#reselect-server-if-overloaded

Syntax: [no] reselect-server-if-overloaded

Setting cache server maximum TCP connection rates

You can modify the maximum connection rate for individual TCP/UDP ports.