After having the 4 bay Pegasus2 with the nMP I've determined that it cannot be reliably used with sleep cycles. After a short while, within a week or two, the disk goes offline. It will usually still show as mounted but it will be wedged, either Rainbow Wheel if you try to access, or it doesn't but there is nothing shown. In either case I'm not finding anything in the console or Promise utility log. I don't know whether to log the bug to Apple, Promise, or who? Unfortunately there is NO diagnostic information I can give, so my hope of getting a fix is low. Anyhow maybe it's because I have four SSD's in a RAID 5, but to test I'd have to copy everything over to another disk somehow and then reinitialize it. This is disappointing as with the new design of the Mac Pro it requires an external disk array for storage, however this is completely unusable. I need something that will survive sleep cycles reliably. Has anybody found anything that works?