ESXi - fix for unknown error enabling HA

Might be useful to those who work with ESXi 5.5 – if the scratch location is low on disk space when enabling HA you’ll get an ‘unknown error’ thrown by ESXi which is really helpful. If you’re not in a position to reconfigure the scratch location (requiring a reboot) then you can probably SSH onto the host and removing a few old log files to clean up the space.

When you SSH onto the server, you can confirm the localstorage volume space using: vdf –h

Check the ‘tmp’ disk space – if its below 100mb you’ll likely run into trouble. If you connect to an EqualLogic SAN, a good location to check for files you can clear down is here: /tmp/scratch/log/equallogic - the log files are often pretty big.