Forum Discussion

RMair's avatar
RMair
Icon for Nimbostratus rankNimbostratus
Mar 31, 2020

Minimal Service Levels in Pool selections

There could probably be better title, but that`s all I could come up with.

 

I`m trying to set up a VS/Pool for a series of file servers running S3 protocol. I have a total of 10 backend servers, 5 in each of 2 remote sites.

 

Each site should be "prime" for connections from that site with the other site as a failover. This is easily done with Priority Groups but therein lies my problem. The pool members need to have a minimum of 4/5 nodes active or performance will suffer.

 

Is there a way that I can fail over to the secondary priority group in the even that the prime group looses 2 (or more) members? I need to really fail the whole group as one, not just add additional nodes to the pool.

application delivery
BIG-IP
LTM
  • Samir's avatar
    Samir
    Icon for MVP rankMVP
    Mar 31, 2020

    You can try other options per my knowledge. Create two pool http_pool1 and http_poo2 with 5 members.

    Now you can manipulate the traffic if primary pool(http_pool1) member fail 4/5 node.

    Hope below iRule will work...

    when HTTP_REQUEST {
  if { [active_members http_pool1] >= 4 } {
    pool http_pool1
  } else { 
    pool http_pool2
	}
}

    Try and let us know..

    • RMair's avatar
      RMair
      Icon for Nimbostratus rankNimbostratus
      Mar 31, 2020

      That seems simple enough. I'll give it a try and see if it gives me the right result.

       

      Thanks