Store data in variable from HTTP_REQUEST to LB_FAILED

Hi,

LB_FAILED is triggered when LTM is ready to send the request to a pool member and one hasn’t been chosen (the system failed to select a pool or a pool member), is unreachable (when no route to the target exists), has reached a queue limit, or is non-responsive (fails to respond to a connection request).

So, LB_FAILED is not only triggered when there is no pool member available in the pool but also when persistent pool member goes down.

if you want to select a new pool when no pool member is available in the default pool, check active_members in HTTP_REQUEST:

when HTTP_REQUEST {
    ...
    set failoverPool $val
    ...
    if { [active_members default_pool] < 1 } {
        pool $failoverPool
    }
}