Maximum Active Sessions on Big IP 6400

ahsan,

 

 

Hello. I'm afraid there is no way answer to this question, especially without knowing what your configuration looks like. BIG-IP is a very flexible product, and with flexibility comes many factors that will impact this number.

 

 

A couple factors that influence max connections are the virtual server profile(s) being used and the presence of iRules, For example, if you are using the standard profile you'll be able to achieve fewer concurrent connections that fastL4, which will itself be lower than the number of client-side connections possible using the FastHTTP profile. Further, the 6400 contains a PVA chip that can handle certain connections without using any system memory at all. Connections to vips that use iRules each use more memory than the same vip without the iRule. The number of extra bytes consumed can be quite small but they add up quickly with several hundred thousand or a couple million connections.

 

 

Hopefully this helps a little. If you only need a general idea of max connections you could compare the 'current connections' and memory graphs in the LTM GUI. If you need something more detailed there are utilities on the command line that would let you gauge your per-connection memory utilization, but the process can become complex depending on how many vips you have, and becomes inaccurate if more than one vip has open connections.

 

 

 

--jesse