0

We have just taken delivery of a new JBOD chassis, with 14 x 2TB NL-SAS drives - 2 have already been earmarked for enclosure spares, so we have 12 drives available.

I have several options for setting up the RAID10 array (unfortunately the head unit won't allow odd-numbered spans):

  • 6 x 2-disk spans (12TB raw)
  • 3 x 4-disk spans (6TB raw)
  • 2 x 6-disk spans (4TB raw)

I would like to get the most usable space so 6x2 is looking favourable and 2x6 doesn't give anywhere near enough space, but I'm wondering if there's any performance or risk hit with going with 6x2 over 3x4.

I think that 6x2 is more risky because each span can only lose one drive - but are the two hot-spares enough to mitigate this?

Can someone sanity-check my reasoning or give me any pointers?

Head unit is an FC Infortrend ES-DS 3024 SAN, and workload will be Veeam backup storage if it makes any difference.

4
  • Why would you not run these in a RAID5 if you are looking for space and redundancy
    – Matt Clark
    Feb 18 '15 at 5:33
  • @Matt the disks will be under heavy bursted load, so the parity calculations will make RAID5 a non-starter, plus the rebuild time for a 2TB disk in RAID5 is way longer than I'd like :) Feb 18 '15 at 8:22
  • 1
    RAID 5 is dead. Feb 18 '15 at 19:37
  • RAID 5 is only dead if you buy cheap and nasty drives.
    – Sobrique
    Feb 18 '15 at 22:19
1

I would use straight RAID 1+0 mirrors... e.g. 6 mirrored pairs striped together.

Keep your spares handy and be sure to monitor the array. Nothing more to it.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.