[ZFS] How to fix corrupt ZDB

[Steven Hartland]

----- Original Message ----- 
From: "Beeblebrox" <zaphod at berentweb.com>
To: <freebsd-fs at freebsd.org>
Sent: Thursday, November 08, 2012 4:07 PM
Subject: Re: [ZFS] How to fix corrupt ZDB


> output for *# zdb* is the same as *# zdb -C*
> bsdr:
>    version: 28
>    name: 'bsdr'
>    state: 0
>    txg: 43281
>    pool_guid: 18171682415991203571
>    hostid: 2739729201
>    hostname: 'rbsd.me'
>    vdev_children: 2
>    vdev_tree:
>        type: 'root'
>        id: 0
>        guid: 18171682415991203571
>        children[0]:
>            type: 'disk'
>            id: 0
>            guid: 3768638969829014374
>            path: '/dev/ada0'
>            phys_path: '/dev/ada0'
>            whole_disk: 1
>            metaslab_array: 30
>            metaslab_shift: 31
>            ashift: 9
>            asize: 320068124672
>            is_log: 0
>            DTL: 42
>            create_txg: 4
>        children[1]:
>            type: 'disk'
>            id: 1
>            guid: 1129540067409051140
>            path: '/dev/ada1p9'
>            phys_path: '/dev/ada1p9'
>            whole_disk: 1
>            metaslab_array: 166
>            metaslab_shift: 24
>            ashift: 12
>            asize: 2035548160
>            is_log: 1
>            create_txg: 23549
> Interestingly, the log on SSD /dev/ada1p9 correctly shows ashift 12 - So
> that is correct. Root pool is on a regular samsung (no 4k).
> 
> *# zdb -l /dev/ada0*
> LABEL 0
> --------------------------------------------
>    version: 28
>    name: 'bsdr'
>    state: 0
>    txg: 43281
>    pool_guid: 18171682415991203571
>    hostid: 2739729201
>    hostname: 'rbsd.me'
>    top_guid: 3768638969829014374
>    guid: 3768638969829014374
>    vdev_children: 2
>    vdev_tree:
>        type: 'disk'
>        id: 0
>        guid: 3768638969829014374
>        path: '/dev/ada0'
>        phys_path: '/dev/ada0'
>        whole_disk: 1
>        metaslab_array: 30
>        metaslab_shift: 31
>        ashift: 9
>        asize: 320068124672
>        is_log: 0
>        DTL: 42
>        create_txg: 4
> The exact same information is repeated 4 times from LABEL 0 -> LABEL 3
> 
> *# zdb -l /dev/ada1p9 *
> LABEL 0
> --------------------------------------------
>    version: 28
>    name: 'bsdr'
>    state: 0
>    txg: 43281
>    pool_guid: 18171682415991203571
>    hostid: 2739729201
>    hostname: 'rbsd.me'
>    top_guid: 1129540067409051140
>    guid: 1129540067409051140
>    is_log: 1
>    vdev_children: 2
>    vdev_tree:
>        type: 'disk'
>        id: 1
>        guid: 1129540067409051140
>        path: '/dev/ada1p9'
>        phys_path: '/dev/ada1p9'
>        whole_disk: 1
>        metaslab_array: 166
>        metaslab_shift: 24
>        ashift: 12
>        asize: 2035548160
>        is_log: 1
>        create_txg: 23549
> The exact same information is repeated 4 times from LABEL 0 -> LABEL 3
> 
> It looks like I made a big deal out of nothing?

Yep that all looks good to me. Your pool is using 512 byte
blocks and your log is using 4k so all fine :)

    Regards
    Steve

================================================
This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. 

In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337
or return the E.mail to postmaster at multiplay.co.uk.