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Forum Discussion

Brian_Gibson_30's avatar
Brian_Gibson_30
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Jun 03, 2014

Create multiple node pairs in a pool

I have a request to set up a single pool in which there are multiple cluster pairs inside of the pool.   So basically how it works is a user connects to a node. If that node fails the user will...
design
Cory_50405's avatar
Cory_50405
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Jun 04, 2014

If I understand your requirement correctly, it sounds like priority group activation may solve your problem. For example, let's say you have a pool with four members (two pairs) assigned to a specific virtual server. Pair A would be the preferred priority group (with a priority of 5 and 4 assigned to the A members, respectively), and pair B would be the backup priority group (member priority of 3 and 2 respectively).

 

With this configuration, all requests would be directed to pair A primary member if it's available. If it becomes unavailable, then traffic would fail to pair A secondary member. Failure of both pair A members would mean traffic gets directed to pair B primary member.

 

http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-concepts-11-1-0/ltm_pools.html1216212

 

Brian_Gibson_30's avatar
Brian_Gibson_30
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Jun 25, 2014
Hi Cory, Thank you for the response. I missed the notification that you responded, thus the long delay in responding. So let's assume we have 2 pairs. Nodes A/B and C/D are the pairs. I want to load balance between A and C. If A fails then I want it to fail to B and if C fails I want it to fail to D. Using Priority group if Node A fails it will fail over to Node B which is not what we are looking to do. Essentially what I need to do is have a group of pools and have the VIP select one of the pools. Each pool would have priority groups inside of it and would have 2 nodes. Perhaps I could use an Irule to do the pool selection. I guess I would just need to figure out how to get the Irule to load balance between pools.