Technical data

ServerIron ADX Advanced Server Load Balancing Guide 55

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Other transparent cache switching options

each while CS4 through CS64 get two buckets each ([2 * 3] + [61 * 2] = 128). The result is that the

original traffic handled by the cache server that went down is now distributed evenly among the

remaining functional cache servers. The traffic on CS2 and CS3 increases by 2.34 percent ([131 -

128] / 128 = 2.34%), and by 1.56 percent on CS4 through S64 ([ 130 - 128] / 128 = 1.56%).

Configuring an increased hash bucket count

You can set the size of the TCS hash bucket count to a value from 256 through 16384 using the

system-max command.

ServerIronADX(config)# system-max tcs-hash-table-size 2048

Syntax: [no] system-max tcs-hash-table-size <hash-table-size>

The <hash-table-size> variable specifies the size that you want to configure the hash table.

Acceptable values are 256, 512, 1024, 2048, 4096, 8192, and 16384. Entering a value for this

variable other than an acceptable value will cause an error message to be displayed. The default

value is 256.

NOTE

The hash table size will only be effective after saving the configuration using the write mem

command and reloading the ServerIron ADX.

Displaying the hash values per BP

You can display the hash values for a specific source and destination IP pair. The output first

displays the current hash table size, then the hash value which is the bucket number for the given

destination and source IP addresses. If a cache server is selected for this bucket, the selected

cache server name is displayed and if no cache server is selected for this bucket, "empty" is

displayed, as shown in the following examples.

ServerIronADX1/1# show cache-hash 1 1.2.3.4 192.168.1.1

Cache-group 1: Hash table size: 512

Hash_info: Dest_mask = 255.255.255.255 Src_mask = 0.0.0.0

bucket#: 38 -> cs1

ServerIronADX1/1# show cache-hash 1 1.2.3.4 192.168.1.1

Cache-group 1: Hash table size: 512

Hash_info: Dest_mask = 255.255.255.255 Src_mask = 0.0.0.0

bucket#: 39 -> empty

Syntax: show cache-hash <cache-group> <destination-IP> <source-IP>

NOTE

This command is available at the BP console only.

NOTE

The hash table is not synced between ServerIron ADX switches for both Hot-Standby and

Active-Active mode.