On Thu, 22 Aug 2013 11:40+0400, Michael BlackHeart wrote:
> Hello,
> I'd like to know what is the best way to convert my pool from 512b
sector
> size to 4k sector size.
>
> Hardware: 2 x2Tb WD Green with 4k physical sector size
>
> Model Family: Western Digital Caviar Green (AF, SATA 6Gb/s)
> Device Model: WDC WD20EARX-00PASB0
> Serial Number: WD-WCAZA8280575
> LU WWN Device Id: 5 0014ee 206032063
> Firmware Version: 51.0AB51
> User Capacity: 2 000 398 934 016 bytes [2,00 TB]
> Sector Sizes: 512 bytes logical, 4096 bytes physical
> Device is: In smartctl database [for details use: -P show]
> ATA Version is: ATA8-ACS (minor revision not indicated)
> SATA Version is: SATA 3.0, 3.0 Gb/s (current: 3.0 Gb/s)
> Local Time is: Thu Aug 22 11:33:16 2013 MSK
> SMART support is: Available - device has SMART capability.
> SMART support is: Enabled
>
> They're running in a mirror
>
> pool: storage
> state: ONLINE
> scan: resilvered 48K in 0h0m with 0 errors on Thu Jul 25 19:18:01 2013
> config:
>
> NAME STATE READ WRITE CKSUM
> storage ONLINE 0 0 0
> mirror-0 ONLINE 0 0 0
> ada3 ONLINE 0 0 0
> ada7 ONLINE 0 0 0
>
> zdb info
>
> storage:
> version: 5000
> name: 'storage'
> state: 0
> txg: 1292269
> pool_guid: 18442220950447532371
> hostid: 708219113
> hostname: 'diablo.miekoff.local'
> vdev_children: 1
> vdev_tree:
> type: 'root'
> id: 0
> guid: 18442220950447532371
> create_txg: 4
> children[0]:
> type: 'mirror'
> id: 0
> guid: 4289294206539029185
> metaslab_array: 33
> metaslab_shift: 34
> ashift: 9
> asize: 2000394125312
> is_log: 0
> create_txg: 4
> children[0]:
> type: 'disk'
> id: 0
> guid: 16348588566764560218
> path: '/dev/ada3'
> phys_path: '/dev/ada3'
> whole_disk: 1
> DTL: 95
> create_txg: 4
> children[1]:
> type: 'disk'
> id: 1
> guid: 7655198429866445090
> path: '/dev/ada7'
> phys_path: '/dev/ada7'
> whole_disk: 1
> DTL: 97
> create_txg: 4
> features_for_read:
>
> As you see ashift is 9 (512b).
>
> I know a common solution with gnop and export-mport pool, but how should I
> manage mirror this way? Should I create a mirror on gnop-ed devices and
> then export-import?
I'm afraid you're out of luck. You need to backup the data
somehow, recreate the pool with ashift=12, and restore the data.
A better option would be to buy a couple of new drives, assuming you
can connect them to the current system, create a new mirrored pool
with ashift=12, and transfer the data using a recursive set of
snapshots on the current pool and a ZFS send stream sent to the new
pool.
--
+-------------------------------+------------------------------------+
| Vennlig hilsen, | Best regards, |
| Trond Endrest?l, | Trond Endrest?l, |
| IT-ansvarlig, | System administrator, |
| Fagskolen Innlandet, | Gj?vik Technical College, Norway, |
| tlf. mob. 952 62 567, | Cellular...: +47 952 62 567, |
| sentralbord 61 14 54 00. | Switchboard: +47 61 14 54 00. |
+-------------------------------+------------------------------------+