[OpenIndiana-discuss] Simple zfs vs zpool space question.
Michael Hase
michael at edition-software.de
Fri Apr 11 14:58:47 UTC 2014
On Fri, 11 Apr 2014, John McEntee wrote:
> I have a zpool (3way mirror and striped across 21 disks), tank, that the zfs and zpool commands differ slightly.
Are you sure it's a 3way mirror pool? Seems like you're running without
any redundancy, look at devices c1t500A075103053202d0p2 and
c1t500A07510306F9A7d0p2. If one of these breaks I think your pool is
toast.
Maybe you wanted to add zil devices and forgot to specify as such? It
should look something like
zpool iostat -v p1
capacity operations bandwidth
pool alloc free read write read write
----------- ----- ----- ----- ----- ----- -----
p1 876G 980G 3 51 106K 295K
mirror 529G 399G 1 18 47.8K 73.7K
c4t1d0 - - 0 8 42.0K 74.5K
c4t2d0 - - 0 8 42.1K 74.5K
mirror 347G 581G 1 30 58.7K 141K
c4t0d0 - - 0 12 42.6K 142K
c4t3d0 - - 0 12 42.7K 142K
logs - - - - - -
c3t12d0s3 1.20M 7.94G 0 1 0 80.6K
cache - - - - - -
c3t12d0s0 48.0G 8M 1 0 13.9K 20.7K
----------- ----- ----- ----- ----- ----- -----
>
> # zpool list tank
> NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
> tank 19.0T 14.5T 4.51T 76% 1.00x ONLINE -
>
> # zfs list tank
> NAME USED AVAIL REFER MOUNTPOINT
> tank 14.5T 4.21T 38K /tank
>
>
> There are no quotas. Please could some suggest why zpool states more space is available over zfs?
Metadata?
Cheers,
Michael
>
> My average IOPS to each single SATA disk is 90, 1390 across the pool as a whole. Due to pushing each disk fairly hard , if the zpool gets more than 80% full the way free space is allocated changes and we have a severe performance hit. This makes (generally one) VMWare host virtually unusable until I free up some space. Does anyone know if this behaviour changes due to the result of zpool or zfs. i.e. which one should I carefully monitor?
>
> Thanks
>
> John
>
> P.S.
>
> # zpool iostat -v
> capacity operations bandwidth
> pool alloc free read write read write
> ------------------------- ----- ----- ----- ----- ----- -----
> rpool 13.2G 26.5G 0 19 3.01K 89.1K
> mirror 13.2G 26.5G 0 19 3.01K 89.1K
> c1t5000CCA216DA22DEd0p1 - - 0 9 6.30K 89.4K
> c1t500A075103053202d0s0 - - 0 10 5.57K 89.4K
> c1t500A07510306F9A7d0s0 - - 0 10 4.56K 89.4K
> ------------------------- ----- ----- ----- ----- ----- -----
> tank 14.5T 4.51T 106 1.39K 5.23M 10.1M
> mirror 2.07T 659G 15 199 765K 1.35M
> c1t5000CCA225C5244Ed0 - - 3 86 350K 1.35M
> c1t5000CCA225C54DDDd0 - - 3 86 353K 1.35M
> c1t5000CCA225C505B8d0 - - 3 86 350K 1.35M
> mirror 2.07T 659G 15 199 765K 1.35M
> c1t5000CCA225C50784d0 - - 3 86 349K 1.35M
> c1t5000CCA225C5502Ed0 - - 3 86 352K 1.35M
> c1t5000CCA225C49869d0 - - 3 86 352K 1.35M
> mirror 2.07T 659G 15 199 766K 1.35M
> c1t5000CCA225C54ED8d0 - - 3 86 351K 1.35M
> c1t5000CCA225C56814d0 - - 3 86 351K 1.35M
> c1t5000CCA225C4E775d0 - - 3 86 350K 1.35M
> mirror 2.08T 659G 15 199 765K 1.35M
> c1t5000CCA225C2ADDAd0 - - 3 85 351K 1.35M
> c1t5000CCA225C04039d0 - - 3 85 352K 1.35M
> c1t5000CCA225C53428d0 - - 3 85 352K 1.35M
> mirror 2.07T 659G 15 199 766K 1.35M
> c1t5000CCA225C50517d0 - - 3 85 352K 1.36M
> c1t5000CCA225C55025d0 - - 3 85 352K 1.36M
> c1t5000CCA225C5660Dd0 - - 3 85 351K 1.36M
> mirror 2.08T 659G 15 199 764K 1.35M
> c1t5000CCA225C5502Dd0 - - 3 85 350K 1.35M
> c1t5000CCA225C484A3d0 - - 3 85 351K 1.35M
> c1t5000CCA225C4824Dd0 - - 3 85 352K 1.35M
> mirror 2.07T 659G 15 199 766K 1.35M
> c1t5000CCA225C4E366d0 - - 3 86 351K 1.35M
> c1t5000CCA225C54DDCd0 - - 3 85 352K 1.35M
> c1t5000CCA225C56751d0 - - 3 85 351K 1.35M
> c1t500A075103053202d0p2 6.89M 7.93G 0 15 1 298K
> c1t500A07510306F9A7d0p2 6.73M 7.93G 0 15 1 298K
> cache - - - - - -
> c1t500A075103053202d0p3 143G 7.86M 20 4 463K 488K
> c1t500A07510306F9A7d0p3 143G 7.75M 21 4 470K 488K
> ------------------------- ----- ----- ----- ----- ----- -----
>
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