Comment 8 for bug 1251803

Jay,

set_host_enabled, which is being called by nova host-update is needed to be implemented when the driver need to perform operations on enable/disable request, while service_update just disables the compute service.

set_host_enabled wasn't implement in the libvirt driver and was introduced to solve the auto disable/re-enable issue.
However, it should have been private.

I think you are right and we do need to discuss
1) nova service-update
2) nova host-update
and make nova host-update to set a reason.

However, at the moment, the auto disable (set_host_enabled) method should be private.