Need redirect to different pool

You can check to see that there is at least one node in the pool marked up using active_members (Click here😞

when LB_SELECTED {
   if {[active_members my_pool] < 1}{
       no nodes available, so set a new pool, send a redirect or send another HTTP response
      ...
   }
}

You could use LB::server pool with active_members to get the active nodes in the currently selected pool:

   [active_members [LB::server pool]] < 1

Try searching for active_members for more examples or reply here.

Aaron