I have 8 drives, they are all RE2 320GB WD SATA drives that I plan to use for my ESXi server. I can either create 3 arrays of raid 1 with 2 hot spares:
Raid 1 320GB
Raid 2 320GB
Raid 3 320GB
2 hot spares (total usable space is 960GB)
Or use all 8 drives for a raid 10 array:
Raid 10 (8 Drives) 1.2TB
I don't mind losing the space with option 1 if i get better performance. None of my VMs are larger then 250GB so they can all fit on a different array. I am running Exchange, SQL, and a few XP images.
I read that SATA drives are not full duplex which leads me to believe that I won't see much if any improvement in breaking out the drives into separate arrays.
What would give me the best I/O performance?