# [OmniOS-discuss] ZFS pool allocation remains after removing all files

Rune Tipsmark rt at steait.net
Thu Oct 9 10:02:51 UTC 2014

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    Thanks for the input Filip,

    I think I found the answer though... no VAAI in OmniOS/ZFS

    VAAI provides amongst other features:

    Thin Provisioning in ESXi 5.x and later hosts, which allows the ESXi host to tell the array when the space previously occupied by a virtual machine (whether it is deleted or migrated to another datastore) can be reclaimed on thin provisioned LUNs.

    Next questions is, will VAAI be supported in OmniOS/ZFS

    Br,
    Rune

    -----Original Message-----
    From: OmniOS-discuss [mailto:omnios-discuss-bounces at lists.omniti.com] On Behalf Of Filip Marvan
    Sent: Wednesday, October 08, 2014 7:53 AM
    To: omnios-discuss at lists.omniti.com
    Subject: Re: [OmniOS-discuss] ZFS pool allocation remains after removing all files

    Hello,

    maybe you will have to enable compression on that ZVOL, and rewrite that disk with zeroes from client. Because your pool propably don't even know from vmware client, that you delete your data.

    Filip

    --------------------------------------------------
    Date: Tue, 7 Oct 2014 23:00:47 +0000
    From: Rune Tipsmark <rt at steait.net>
    To: omnios-discuss <omnios-discuss at lists.omniti.com>
    Subject: [OmniOS-discuss] ZFS pool allocation remains after removing
    	all	files
    Message-ID: <3dde7c3ae1994829b588d3df09855cf0 at EX1301.steait.net>
    Content-Type: text/plain; charset="us-ascii"

    hi guys, wondering if someone might know why my pool is still allocated 1.45T after I removed the files on the LU's provisioned onto that pool.

     pool: pool02
     state: ONLINE
      scan: scrub in progress since Wed Oct  8 02:31:41 2014
        29.1G scanned out of 1.45T at 52.4M/s, 7h54m to go
        0 repaired, 1.96% done
    config:

            NAME                       STATE     READ WRITE CKSUM
            pool02                     ONLINE       0     0     0
              mirror-0                 ONLINE       0     0     0
                c4t5000C500570858EFd0  ONLINE       0     0     0
                c4t5000C50057085A6Bd0  ONLINE       0     0     0
              mirror-1                 ONLINE       0     0     0
                c4t5000C500570870D3d0  ONLINE       0     0     0
                c4t5000C50057089753d0  ONLINE       0     0     0
            logs
              c11d0                    ONLINE       0     0     0
            cache
              c13d0                    ONLINE       0     0     0
              c15d0                    ONLINE       0     0     0

    Supporting 3 LU's mounted in Vmware, I formatted the LUNs again and no change...

    Do I really  need to delete the pool, then re-create it?

    br,
    Rune

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