Disable a pool (not a pool member)

You can't disable a pool (in turn disabling all pool members), but you can disable each pool member, in turn disabling the pool.

You could disable each member of a pool in turn in an iRule, but that would simply trigger the monitors, which would then mark each pool member UP again.

The best way to do what you need is to use the monitor results to enable/disable each pool member. If your http monitor "GET /admin/mode.txt" on port 8200 expects "normal" in the response, then update each "/admin/mode.txt" in the port 8200 container on each server to return "down" while you have you maintenance window, and then back to "normal" again when you have finished. This is easily automatable.