Error 20400 – VMM 2012 R2

Error (20400)

1 parallel subtasks failed during execution.

 Error (2605)

Unable to connect to the VMM database because of a general database failure.

SQL error code: 547

Recommended Action

Ensure that the SQL Server is running and configured correctly, then try the operation again.

We have received this error while removing a Hyper-v cluster out of VMM 2012 R2. Even trying to reinstall VMM agent fails manually. Trying both Remove-SCVMHost and Remove-SCVMHostCluster with -Force also failed miserably!

I have found a good article that takes you through these steps of removing hosts/cluster from the DB end, just make sure you have a backup before you start.

You can find the article here.

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