Enter Maintenance mode: Operation Time out
I’ve got this question a couple of time through email and in my training. Let me explain the error (in my case because there can be multiple causes).
A while ago I giving a VMware course where I had 2 ESX host available. Both host where member of a HA en DRS cluster. When I tried to put one host in maintenance mode I took forever and finally I ended up with the error:
Operation Time out
Looking at the Tasks and Events tab didn’t make me any wiser. I looked like a VM was the problem but this VM migrated successfully. The real cause of the problem was HA. In this configuration HA prevented to put one host in maintenance mode because then HA didn’t have enough hosts available for failover. Temporally disabling HA solved the problem.
Again this is one solution. There can me multiple causes witch prevent putting a host in maintenance mode.
Michael Wilmsen is a experienced VMware Architect with more than 20 years in the IT industry. Main focus is VMware vSphere, Horizon View and Hyper Converged with a deep interest into performance and architecture.
Michael is VCDX 210 certified, has been rewarded with the vExpert title from 2011, Nutanix Tech Champion and a Nutanix Platform Professional.
