It’s 3 O’Clock in the morning, do you know where your Xenserver Poolmaster is? Your client calls you frantic, and you start a GoToMeeting to see what’s wrong. If it’s down, this could have been the result of a few issues. Maybe there was a network glitch which resulted in the Citrix XenServer Poolmaster fencing itself from the rest of the farm. This can also result during a power outage, or other catastrophic failure. This is the normal defense mechanism built into Xenserver, and in the consulting world we see this type of scenario often. You can’t simply reboot the Poolmaster to bring it online. Restarting the toolstack will do you no good. There is a complex process that must be followed, so let’s discuss it -
How do I know if my Poolmaster is down?
If you’ve tried to connect to the pool from the Xencenter console, and it failed – your Poolmaster may be down. Verify this by dropping to a command prompt and issue a command like “Xe host-list” to see if you get a coherent response. If you get an error message like ““Cannot perform operation as the host is running in emergency mode” – then your Poolmaster is almost certainly down.