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

[Richard Jahnel]

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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