My setup is as follows:
Server - 2012 R2 physical with lots of RAM + processors. Running deduplication.
SQL - SQL 2012 SP2 installed locally. On C:, so not deduplicated.
Veeam - v7 patch 4.
I'm seeing this error on my tape jobs:
9/8/2014 1:04:35 PM :: Task D:\Backup\XYZ.vbk failed: Microsoft SQL server hosting the configuration database is currently unavailable. Possible reasons are heavy load, networking issue, server reboot, or hot backup.
Please wait, and try again later.
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.
This fails when no other jobs/deduplication processes are running. My normal backup jobs run fine, so it seems to be a tape issue.