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The default virtual controller for Windows 2012 is the "LSI Logic SAS" controller. If you want to run tests with another model, you can select one while creating a new custom VM. In order to simulate an SSD add scsiX:Y.virtualSSD = 1 for the appropriate SCSI ID (X:Y) to the configuration (.vmx) file.
Thanks for your suggestion.
I tried out what you said and it works!
I can now see 2 of the disks that I have put in as SSDs as SSDs.
However, I would also like the other 2 to detect as SCSI.
Unfortunatly they are still showing as "Unknown".
Can you pls help me with this as well?
Do you by chance know why Server 2012 R2 doesnt detect the SCSI HDDs as SCSI?
Here is a screenshot
What exactly are you trying to achieve? In case you want to create a tiered storage pool with the virtual disks it may be sufficient to set the proper MediaType for the "Unknown" disks, running e.g. Set-PhysicalDisk -FriendlyName PhysicalDisk# -MediaType HDD for each unknow disk.
For details about the PowerShell command see Set-PhysicalDisk
Thanks André, it works!