As Chris mentioned in the following thread, there is no toggle set every
rserver under a serverfarm out of service.
https://supportforums.cisco.com/message/3155842#3155842
If you can add a probe, you could be possible with dummy probe.
For example, when your all servers don't open port# 10000, allservers
may go down with the following configuration.
--
probe tcp dummy
port 10000
faildetect 1
passdetect interval 600
passdetect count 10
serverfarm host sf1
probe dummy
rserver sv1
inservice
rserver sv2
inservice
--
By removing 'probe dummy' config from serverfarm, rservers may return operational.
You may go down all servers in a serverarm easily but load of probe process may
increase since ACE sends dummy probe to all rservers.
Regards,
Yuji