An upgrade to SQL server 2012 SP4 has failed, context:
I'm patching a 2 node AG cluster the first patch has been applied to secondary node successfully:
I then failed over the secondary node. Then I began patching primary node:
The primary node patch failed I have got no idea why it failed and the SQL instance is no longer accessible.
I restored from a VM snapshot, tried it again and got the same error.
Looking at these error log files I can't make sense of what went wrong.
Any assistance is appreciated.