Causing GTM failover if there are not enough LTM pool members available

Hello,

 

 

I'm trying to set up a Global availability GTM setup where by a failover of the WIP will be caused when the LTM pool has less than 12 members available (from a possible 16). However, I can't see how this can be configured at present.

 

 

I've looked at the LTM pool config with "min active members" which only seems to be used with priority groups. GTM bigip monitors don't seem to have the ability to query the number of active members in a pool either.

 

 

I imagine I can execute this in an LTM irule (by getting active_members, then disabling the rest of the members if there aren't enough), however, this isn't going to be able to recover itslef automatically.

 

 

Is there a way either on the LTM or GTM to cause an LTM VIP or GTM server to be disabled when it's pool members reaches a minimum number of servers?