I have three in that pool I mentioned above, I have 2 in another pool. There can be different RAID sets within the same pool, in fact I have them purposly that way so that "automatic raid" performance load balancing can function. I had 2 RAID10 and 1 RAID 50, then converted one more to RAID 50 with no problems.
  Currently I have 2 equallogic arrays, a PS5000( 4TB )and PS6000( 8TB ) in a group and am using RAID 10. So this gives me a usable space of about 4.5TB, when you account for the online spares. I am considering converting from RAID 10 to RAID 50 which would effectivly double my capacity. Does this procedure take a long time? Are there any caveats to this process? From the manuals it looks pretty straight forward and the risk of data loss is quite minimal. Any info or links to docs would be great. Thanks.   J
convert raid