It isn't clear why you are trying to change the master at this time. Can you explain? What is the status of the two hosts that have been patched and rebooted?
@irtaza9 it scans all the VDI's on the SR to see if something has changed, if there's a need for coalesce and so on.
I dont think it will be a big issue if you increase the auto-scan-interval value to lets say 5 minutes (300 seconds), but do remember, that everything regarding the VDI's on the SR will take up to 5 minutes to update, as well as triggering coalesce after removing snapshots.
