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Forum Discussion

Matt_Breedlove_'s avatar
Matt_Breedlove_
Icon for Nimbostratus rankNimbostratus
Apr 21, 2011

Concurrency with multiple VS using a single global var

    In the scenario of having three different VS's simultaneously taking traffic on their respective ports....a port 443 VS, port 8080 VS, and port 8181 VS. All VS's have the same IP. Each V...
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devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Apr 22, 2011
Hi Matt,

 

 

Which LTM version are you doing this on? In any version, I think access to the global variable will be serialized. Maybe others can confirm/correct this.

 

 

However, using a global variable will prevent a virtual server from being processed via CMP on multiple TMM instances. If you're on a version and platform which support CMP, it would be better to use the session table or subtable to store the variable. Here's an example for using the session table. See the links for details on CMP.

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/CMP_v10_compatible_counters_using_the_session_table.html

 

 

Aaron