ZFS - RAIDZ1 Recovery

[BlackCat]

Hello Evgeny,

2016-05-27 1:26 GMT+03:00 esamorokov <esamorokov at gmail.com>:
> I have 3 x 3TB in RAIDZ1, where one drive is gone and I accidentally
> screwed the other two. The data should be fine, just need to revert
> uberblock in point of time, where i started doing changes.
>
try the following command, it just checks whether is possible to
import your pool by discarding some of the most recent writes):

# zpool import -fFn 2918670121059000644 zh_vol_old

Because you have already created a new pool with the same name as old,
this command import pool by it ID (2918670121059000644) with new name
(zh_vol_old).

> History:
>     I was using WEB GUI of FreeNas and it reported a failed drive
>     I shutdown the computer and replaced the drive, but I did not noticed
> that I accidentally disconnected power of another drive
>     I powered on the server and expanded the pool where there only one drive
> of the pool was active

As far as I understand attached log, zfs assumes that disk data
corrupted. But this is quite stranger, since zfs normally survives if
you forget to attach some disk during bad disk replacement.

>     Then I began to really learn ZFS and messing up with bits
>     At some point I created a backup bit-to-bit images of the two drives
> from the pool (using R-Studio)
>
The question of curiosity: do you experimenting now with copies or
with original disks?

>
> Specs:
>     OS: FreeBSD 9.2-RELEASE (FREENAS.amd64) #0 r+2315ea3: Fri Dec 20
> 12:48:50 PST 2013
>     RAID:   [root at juicy] ~# camcontrol devlist
>     <ST3000DM001-1CH166 CC29>          at scbus1 target 0 lun 0 (pass1,ada1)
>     <ST3000DM001-1CH166 CC29>          at scbus2 target 0 lun 0 (ada2,pass2)
>     <ST3000DM001-9YN166 CC4H>          at scbus3 target 0 lun 0 (pass3,ada3)
>     [root at juicy] ~# zdb
> zh_vol:
>     version: 5000
>     name: 'zh_vol'
>     state: 0
>     txg: 14106447
>     pool_guid: 2918670121059000644
>     hostid: 1802987710
>     hostname: ''
>     vdev_children: 1
>     vdev_tree:
>         type: 'root'
>         id: 0
>         guid: 2918670121059000644
>         create_txg: 4
>         children[0]:
>             type: 'raidz'
>             id: 0
>             guid: 14123440993587991088
>             nparity: 1
>             metaslab_array: 34
>             metaslab_shift: 36
>             ashift: 12
>             asize: 8995321675776
>             is_log: 0
>             create_txg: 4
>             children[0]:
>                 type: 'disk'
>                 id: 0
>                 guid: 17624020450804741401
>                 path: '/dev/gptid/6e5cea27-7f52-11e3-9cd8-d43d7ed5b587'
>                 whole_disk: 1
>                 DTL: 137
>                 create_txg: 4
>             children[1]:
>                 type: 'disk'
>                 id: 1
>                 guid: 3253299067537287428
>                 path: '/dev/gptid/2b70d9c0-8e40-11e3-aa1c-d43d7ed5b587'
>                 whole_disk: 1
>                 DTL: 133
>                 create_txg: 4
>             children[2]:
>                 type: 'disk'
>                 id: 2
>                 guid: 17999524418015963258
>                 path: '/dev/gptid/1e898758-9488-11e3-a86e-d43d7ed5b587'
>                 whole_disk: 1
>                 DTL: 134
>                 create_txg: 4
>     features_for_read:

-- 
BR BC