# [OmniOS-discuss] ZFS cache device allocation a free seem strange on my OmniOS r151022 system.

Richard Jahnel rjahnel at ellipseinc.com
Tue Sep 5 15:03:33 UTC 2017

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    Yes, this issue has been lurking around since they made the arcs compressible. I really wish they would revert that change. There have been at least 3 illumos issues filed for this and two fixes attempted. So far it still persist. For now I have my cache drives removed from my production pools.

    From: OmniOS-discuss [mailto:omnios-discuss-bounces at lists.omniti.com] On Behalf Of Richard Skelton
    Sent: Friday, September 1, 2017 6:04 PM
    To: omniOS-discuss <omnios-discuss at lists.omniti.com>
    Subject: [OmniOS-discuss] ZFS cache device allocation a free seem strange on my OmniOS r151022 system.

    Hi,
    The cache allocation a free seem strange on my OmniOS r151022 system.
    The cache device is an Intel SSD DC P3700 Series 800GB, 1/2 Height PCIe 3.0, 20nm, MLC
    root at omnios:/scratch# zpool list -v scratch
    NAME                         SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
    scratch                     2.66T  1.94T   738G         -    17%    72%  1.00x  ONLINE  -
      mirror                     544G   395G   149G         -    16%    72%
        c7t5000CCA018309809d0       -      -      -         -      -      -
        c18t5000CCA038718395d0      -      -      -         -      -      -
      mirror                     544G   396G   148G         -    15%    72%
        c14t5000CCA038710745d0      -      -      -         -      -      -
        c11t5000CCA038721F5Dd0      -      -      -         -      -      -
      mirror                     544G   396G   148G         -    18%    72%
        c12t5000CCA03871048Dd0      -      -      -         -      -      -
        c13t5000CCA0387102E1d0      -      -      -         -      -      -
      mirror                     544G   398G   146G         -    19%    73%
        c15t5000CCA03871058Dd0      -      -      -         -      -      -
        c16t5000CCA0387224EDd0      -      -      -         -      -      -
      mirror                     544G   396G   148G         -    17%    72%
        c17t5000CCA038717F65d0      -      -      -         -      -      -
        c10t5000CCA038717AC9d0      -      -      -         -      -      -
    log                             -      -      -         -      -      -
      c6t0d0                    3.84G      0  3.84G         -     0%     0%
    cache                           -      -      -         -      -      -
      c3t1d0                     745G  1.07T  16.0E         -     0%   147%
    spare                           -      -      -         -      -      -
      c9t5000CCA038717B2Dd0         -      -      -         -      -      -
      c8t5000CCA0387104B1d0         -      -      -         -      -      -
    root at omnios:/scratch# format </dev/null
    Searching for disks...done

    AVAILABLE DISK SELECTIONS:
           0. c2t4d0 <Samsung-SSD 850 PRO 256GB-EXM02B6Q-238.47GB>
              /pci at 0,0/pci8086,35c5 at 1f,2/disk at 4,0
           1. c2t5d0 <Samsung-SSD 850 PRO 256GB-EXM02B6Q-238.47GB>
              /pci at 0,0/pci8086,35c5 at 1f,2/disk at 5,0
           2. c3t1d0 <INTEL-SSDPEDMD800G4-8DV10171-745.21GB>
              /pci at 75,0/pci8086,6f0a at 3,2/pci8086,3702 at 0/blkdev at 1,0
           3. c6t0d0 <DDRDRIVE-X1-0078-3.87GB>
              /pci at 75,0/pci8086,6f06 at 2,2/pci19e3,81 at 0/sd at 0,0

    Cheers
    Richard
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