Date: Fri, 8 Apr 2016 21:53:52 +0200 From: Sebastian Wolfgarten <sebastian@wolfgarten.com> To: freebsd-questions@freebsd.org Subject: Zfs - broken disk - add instead of attach - How to go back to mirrored setup? Message-ID: <6ACA8DAA-7D86-4FD0-B08C-2030CFF575C1@wolfgarten.com>
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Dear all,
I used to have a ZFS-based mirror and now thanks to a typo I have one =
big disk of 5.4TB instead of a 2.7T mirror - how do I get back to having =
a mirror?
Here is what happened:
Last week one of my hard drives broke requiring me to detach & replace =
the disk:
server1 - ZFS pool - HEALTH fault=20
NAME SIZE ALLOC FREE FRAG EXPANDSZ CAP DEDUP HEALTH =
ALTROOT
zroot 2.72T 763G 1.97T 18% - 27% 1.00x DEGRADED -=20=
pool: zroot
state: DEGRADED
status: One or more devices has been removed by the administrator.
Sufficient replicas exist for the pool to continue functioning in a
degraded state.
action: Online the device using 'zpool online' or replace the device =
with
'zpool replace'.
scan: scrub repaired 0 in 3h48m with 0 errors on Fri Mar 25 10:48:35 =
2016
config:
NAME STATE READ WRITE CKSUM
zroot DEGRADED 0 0 0
mirror-0 DEGRADED 0 0 0
5383010007106655398 REMOVED 0 0 0 was
/dev/diskid/DISK-Z1F0LSM7p3
gpt/zfs1 ONLINE 0 0 0
errors: No known data errors
# zpool detach zroot /dev/diskid/DISK-Z1F0LSM7p3
After the provider put in a new disk, I made a mistake (i.e. I added the =
disk to the zroot pool instead of attaching it) and now I was wondering =
how to recover from this situation:
# zpool add zroot ada0
Here is what zroot now looks like:
# zpool status zroot
pool: zroot
state: ONLINE
scan: scrub canceled on Fri Apr 8 21:27:31 2016
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
gpt/zfs1 ONLINE 0 0 0
ada0 ONLINE 0 0 0
errors: No known data errors
I tried to remove/disable/offline the second disk but that did not work:
# zpool offline zroot ada0
cannot offline ada0: no valid replicas
# zpool remove zroot ada0
cannot remove ada0: only inactive hot spares, cache, top-level, or log =
devices can be removed
# zpool detach zroot ada0
cannot detach ada0: only applicable to mirror and replacing vdevs
Now my question is: How can I get back to having a mirror without =
loosing all the data on ada1? Any ideas? Using ZFS split maybe?
Many thanks.
Best regards
Sebastian
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