I would like to pick the brains of the ZFS experts on this list: What
would you do next to try and recover this zfs pool?
I have a ZFS RAIDZ1 pool named bank0 that I cannot import. It was
composed of 4 1.5 TiB disks. One disk is totally dead. Another had
SMART errors, but using GNU ddrescue I was able to copy all the data
off successfully.
I have copied all 3 remaining disks as images using dd on to another
another filesystem. Using the loopback filesystem I can treat these
images as if they were real disks. I've made a snapshot of the
filesystem the disk images are on so that I can try things and
rollback the changes if needed.
"gir" is the computer these disks are hosted on. It used to be a
Nexenta server, but is now Ubuntu 11.10 with the zfs on linux modules.
I have tried booting up Solaris Express 11 Live CD and doing "zpool
import -fFX bank0" which ran for ~6 hours and put out: "one or more
devices is currently unavailable"
I have tried "zpool import -fFX bank0" on linux with the same results.
I have tried moving the drives back into the controller config they
where before, and booted my old Nexenta root disk where the
/etc/zfs/zpool.cache still had an entry for bank0. I was not able to
get the filesystems mounts. I can't remember what errors I got. I can
do it again if the errors might be useful.
Here is the output of the different utils:
root@gir:/bank3/hd# zpool import -d devs
pool: bank0
id: 3936305481264476979
state: FAULTED
status: The pool was last accessed by another system.
action: The pool cannot be imported due to damaged devices or data.
The pool may be active on another system, but can be imported using
the '-f' flag.
see: http://www.sun.com/msg/ZFS-8000-EY
config:
bank0 FAULTED corrupted data
raidz1-0 DEGRADED
loop0 ONLINE
loop1 ONLINE
loop2 ONLINE
c10t2d0p0 UNAVAIL
root@gir:/bank3/hd# zpool import -d devs bank0
cannot import 'bank0': pool may be in use from other system, it was
last accessed by gir (hostid: 0xa1767) on Mon Oct 24 15:50:23 2011
use '-f' to import anyway
root@gir:/bank3/hd# zpool import -f -d devs bank0
cannot import 'bank0': I/O error
Destroy and re-create the pool from
a backup source.
root@gir:/bank3/hd# zdb -e -p devs bank0
Configuration for import:
vdev_children: 1
version: 26
pool_guid: 3936305481264476979
name: 'bank0'
state: 0
hostid: 661351
hostname: 'gir'
vdev_tree:
type: 'root'
id: 0
guid: 3936305481264476979
children[0]:
type: 'raidz'
id: 0
guid: 10967243523656644777
nparity: 1
metaslab_array: 23
metaslab_shift: 35
ashift: 9
asize: 6001161928704
is_log: 0
create_txg: 4
children[0]:
type: 'disk'
id: 0
guid: 13554115250875315903
phys_path: '/pci@0,0/pci1002,4391@11/disk@3,0:q'
whole_disk: 0
DTL: 57
create_txg: 4
path: '/bank3/hd/devs/loop0'
children[1]:
type: 'disk'
id: 1
guid: 17894226827518944093
phys_path: '/pci@0,0/pci1002,4391@11/disk@0,0:q'
whole_disk: 0
DTL: 62
create_txg: 4
path: '/bank3/hd/devs/loop1'
children[2]:
type: 'disk'
id: 2
guid: 9087312107742869669
phys_path: '/pci@0,0/pci1002,4391@11/disk@1,0:q'
whole_disk: 0
DTL: 61
create_txg: 4
faulted: 1
aux_state: 'err_exceeded'
path: '/bank3/hd/devs/loop2'
children[3]:
type: 'disk'
id: 3
guid: 13297176051223822304
path: '/dev/dsk/c10t2d0p0'
devid:
'id1,sd@SATA_____ST31500341AS________________9VS32K25/q'
phys_path: '/pci@0,0/pci1002,4391@11/disk@2,0:q'
whole_disk: 0
DTL: 60
create_txg: 4
zdb: can't open 'bank0': No such file or directory
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