[oi-dev] SSD-based pools

[Andrew M. Hettinger]

I'm presently running tests on a pool using 3x Samsung 850 SSDs on a
LSI-9211-8i (IT) contoller. I thought I'd try seperating the intent log to
see if lowering the write amplification on the pool-drives would help, so I
added another matching SSD for that, but under load I still seem to get
extensive checksum errors. Does anyone have any ideas as to what would be
causing this?

  pool: test-array
 state: DEGRADED
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are
unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://illumos.org/msg/ZFS-8000-9P
  scan: scrub repaired 0 in 0h0m with 0 errors on Wed Sep 24 18:20:56 2014
config:

        NAME                       STATE     READ WRITE CKSUM
        test-array                 DEGRADED     0     0     0
          mirror-0                 DEGRADED     0     0     0
            c0t50025388700060D4d0  DEGRADED     0     0   155  too many
errors
            c0t50025388700060AEd0  DEGRADED     0     0   149  too many
errors
            c0t50025388700060C2d0  DEGRADED     0     0   174  too many
errors
        logs
          c0t50025388A067DBE9d0    ONLINE       0     0     0

errors: No known data errors
  ---- errors ---
  s/w h/w trn tot device
    0   2   6   8 c0t50025388700060D4d0
    0   0   0   0 c0t50025388700060AEd0
    0   0   0   0 c0t50025388700060C2d0
    0   0   0   0 c0t50025388A067DBE9d0


Andrew Hettinger
http://Prominic.NET | Skype: AndrewProminic
Tel: 866.339.3169 (toll free) -or- 1.217.356.2888 x. 110 (int'l)
Fax: 866.372.3356 (toll free) -or- 1.217.356.3356            (int'l)
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