I have been googling around for instructions to service pack (SQL Server 2012 service pack 2) a SQL instance that is clustered and has mirrored databases. I have found instructions for coping with a clustered instance and for mirrored databases but not both. I think the following will work.
Assume a cluster of 2 nodes A & B and a non-clustered server, M, hosting mirrored databases. The instance is currently running on A.
1. Patch B.
2. Suspend the mirrors (set partner suspend).
3. Patch M.
4. Failover the SQL instance from A to B. This will upgrade the instance to SP2.
5. Resume the mirrors (set partner resume).
6. Patch A.
7. (Optional) Failover the SQL instance from B to A and check all OK.
Can anyone see anything wrong with this or know of a better way?