We will be using SCCM to deploy SQL Server Service packs, we have a team in our company which have create this package for us.

This Packages does all the check which service pack requires, also, we have manually added two more checks

1) server been rebooted in last 1 day if no give an error

2) route system database (not user) backups to local drive C:

and do the silent install.

We are still in testing phase of this package... but i think its a good and effective way of automating service packs in sql servers