After using SCOM 2012 R2 for a few weeks we started to get “Free Space Low” alerts for it’s own databases.
On investigation the default SQL instance has been setup with Autogrowth set to None. So remember to change this to something more appropriate after installation or you’ll soon run into some issues.
As a minimum I changed the settings to be:
Initial size: 5000MB
Autogrowth: 1000MB, unlimited
Initial size: 1000MB
Autogrowth: 100MB, unlimited