Zpool (2-mirror) with mixed ashift

[Steven Hartland]

ashift is only automatically calculated in HEAD or 10 (currently in alpha)

If you're running something older then use gnop to configure 4k sectors
and then creation your pool on .nop device.

    Regards
    Steve
----- Original Message ----- 
From: "Vladislav V. Prodan" <universite at ukr.net>
To: <fs at freebsd.org>
Sent: Sunday, September 29, 2013 10:16 PM
Subject: Zpool (2-mirror) with mixed ashift


> Hi all!
> 
> I have the misfortune. :(
> I had a system with two HDD with a cluster size of 512b.
> Due to lack of space in the system, it was decided to put the 4 3TB HDD
> in 2-mirror zfs pool
> I used the instructions from the forum:
> http://forums.freebsd.org/showthread.php?t=37819
> But with the addition of the second mirror and the second mirror turned
> out to ashift = 9.
> Notice now zfs pool filled with more than 50%
> How can I safely do a second mirror in the pool ashift=12 without losing
> data?
> How to continue to create 2-mirror zfs pool for 4k HDD?
> 
> Thank you.
> A little more than further information:
> 
> FreeBSD 9.1-STABLE #0 r251351M: Sat Jun 15 01:22:15 EEST 2013    amd64
> 
> # zpool list tank
> NAME   SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
> tank  5,44T  3,23T  2,21T    59%  1.16x  ONLINE  -
> 
> # zfs list tank
> NAME   USED  AVAIL  REFER  MOUNTPOINT
> tank  3,41T  2,12T   186K  /tank
> 
> # zpool status
>  pool: tank
> state: ONLINE
>  scan: resilvered 2,38T in 8h46m with 0 errors on Mon Jun 17 02:32:29 2013
> config:
> 
>        NAME           STATE     READ WRITE CKSUM
>        tank           ONLINE       0     0     0
>          mirror-0     ONLINE       0     0     0
>            gpt/disk3  ONLINE       0     0     0
>            gpt/disk4  ONLINE       0     0     0
>          mirror-1     ONLINE       0     0     0
>            gpt/disk0  ONLINE       0     0     0
>            gpt/disk1  ONLINE       0     0     0
> 
> errors: No known data errors
> 
> 
> # zdb
> tank:
>    version: 5000
>    name: 'tank'
>    state: 0
>    txg: 47135
>    pool_guid: 13092523331396101530
>    hostid: 143250101
>    hostname: 'mary-teresa.XXXXX.ua'
>    vdev_children: 2
>    vdev_tree:
>        type: 'root'
>        id: 0
>        guid: 13092523331396101530
>        children[0]:
>            type: 'mirror'
>            id: 0
>            guid: 3335739818
>            whole_disk: 0
>            metaslab_array: 34
>            metaslab_shift: 34
>            ashift: 12
>            asize: 3000586993664
>            is_log: 0
>            create_txg: 4
>            children[0]:
>                type: 'disk'
>                id: 0
>                guid: 11030443378289800725
>                path: '/dev/gpt/disk3'
>                phys_path: '/dev/gpt/disk3'
>                whole_disk: 1
>                DTL: 39
>                create_txg: 4
>            children[1]:
>                type: 'disk'
>                id: 1
>                guid: 11332687226484843334
>                path: '/dev/gpt/disk4'
>                phys_path: '/dev/gpt/disk4'
>                whole_disk: 1
>                DTL: 24
>                create_txg: 4
>                resilvering: 1
>        children[1]:
>            type: 'mirror'
>            id: 1
>            guid: 17121080319583017092
>            metaslab_array: 38
>            metaslab_shift: 34
>            ashift: 9
>            asize: 3000586993664
>            is_log: 0
>            create_txg: 47133
>            children[0]:
>                type: 'disk'
>                id: 0
>                guid: 4425616934581567964
>                path: '/dev/gpt/disk0'
>                phys_path: '/dev/gpt/disk0'
>                whole_disk: 1
>                create_txg: 47133
>            children[1]:
>                type: 'disk'
>                id: 1
>                guid: 5113772130885677504
>                path: '/dev/gpt/disk1'
>                phys_path: '/dev/gpt/disk1'
>                whole_disk: 1
>                create_txg: 47133
>    features_for_read:
> 
> 
> 
> -- 
> Vladislav V. Prodan
> System & Network Administrator
> http://support.od.ua
> +380 67 4584408, +380 99 4060508
> VVP88-RIPE
> _______________________________________________
> freebsd-fs at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
> To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org"
>

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