I think you would get the best performance if you run 8+1 , at least if your running Raid5.
From the Documentation:
On a RAID 50 logical disk, data is striped across rows of RAID 5 sets. A RAID 5 set, or parity set, must contain at least three chunklets. A RAID 5 set with three chunklets has a total of two chunklets of space for data and one chunklet of space for parity. RAID 5 set sizes with between 3 and 9 chunklets are supported. The data and parity steps are striped across each chunklet in the set. The chunklets in each RAID 5 set are distributed across different physical disks, which may be located in different drive magazines or even different drive cages. The number of sets in a row is the row size. The system accesses the data from a RAID 50 logical disk in step sizes. The step size is the number of contiguous bytes that the system accesses before moving on to the next chunklet. A RAID 5 set can function with the loss of any one of the chunklets in the set.
3. Can magazines be shared by multiple CPGs or once filtered be exclusive to that CGP
If you filter them out and only add certain disk to a CPG , then you can still use them in another CPG if you don't filter it out on that one.
But all in all I think you would just make more work for yourself if you start to filter out CPG from certain disks.
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