Error: A server-side database availability group
administrative operation failed. Error Failed to add or remove the
Failover-Clustering feature. Error: The request to add or remove features on
the specified server failed. A DISM session could not be opened. An error
occurred accessing the temporary folder
C:\Windows\TEMP\57ACE2DE-4CD2-4F5F-B7A0-93D867A89A12. Ensure that the path to
the temporary folder exists and that you have Read/Write permissions on the
folder. Error: 0x80070070
Solution: I was
attempting to remotely add the DAG member from the ECP on my workstation. I logged into
the server and found that the system drive was nearly full (<100MB free).
Luckily this mailbox server was a virtual machine, and I was able to quickly
expand the drive using VMM. After doing this I was able to successfully add the mailbox server to the DAG.
