On 24 July 2014 09:45, hannah commodore <hannah@tinfoilhat.net> wrote:
I've inherited a system which has an Adaptec 2420SA RAID controller and 4x SSDs running in RAID6. There's no end to problems experienced with this setup; a disk seems to time out and get ejected from the controller at least every week. It's not always the same disk though, and I've tried replacing each of the SSDs with their spares, to no avail.
Why the hell would someone choose to create a four-disk RAID6 array? It doesn't make any sense! I'd start by breaking off the two parity disks, and turning them into half of a degraded RAID10 array; port the data over, then take the remaining raid6 disks and add them too. You now have the same level of redundancy but much better performance. While you're there, I'd switch from hardware raid to linux software raid, as hardware raid generally doesn't support SSDs very well at the moment. (More in the sense of handling TRIM and SMART rather than kicking them out of the array.. don't know what is causing that.) -T