When installing OM12 one needs to enter the sizes required for both OM12 databases. Of course, you have done your homework and calculated the required sizes for both OM12 databases using the OM12 Sizing Helper Tool (this file is way down the list):
However, the question is WHEN do you set the sizes of those databases? My advice is not to set them during the installation, as shown in these two screenshots for the OperationsManager and OperationsManagerDW databases:
But leave those sizes at their defaults (1000 MB) during the installation. Why?
Already in the days of SCOM (R2) I noticed when I changes the size of those databases during the installation, it could take a really long time for setup to finish. Which isn’t a good thing since the installation is a basic thing to be performed and the time saved during that phase can be used in a better way, like configuring SCOM R2.
With OM12 the same thing is still happening. When changing the sizes of the databases to their proper values during the installation, it takes a long time to create those databases. Therefore I always use this approach:
In the next posting I’ll tell you more about the owner of the OM12 databases which is easily overlooked but needs some attention as well.