Windows 8 and Server 2012 enable by default a scheduled process to defrag or optimize your disks.
Running Defrag on your SSD is bad as it increases the wear on the SSD without any value. What you should run on your SSDs is TRIM.
Running Defrag on the tRAID disks should typically not be an issue for as long as it is done a disk at a time and for most setup.
If it ever turns out that such task is troublesome for your setup, you can exclude your tRAID disks and SSDs from the Windows scheduled Defrag operations.