Hi Hans-Christian,
Can you provide the commands you used to create this pool?
Are the pool devices actually files? If so, I don't see how you
have a pool device that starts without a leading slash. I tried
to create one and it failed. See the example below.
By default, zpool import looks in the /dev/dsk directory so
you would need to include the -d /dir option to look in an
alternative directory.
I'm curious how you faulted the device because when I fault
a device in a similar raidz1 configuration, my pool is only
degraded. See below. Your pool is corrupted at a higher level.
In general, RAID-Z redundancy works like this:
raidz can withstand 1 device failure
raidz2 can withstand 2 device failures
raidz3 can withstand 3 device failures
Thanks,
Cindy
# mkdir /files
# mkfile 200m /files/file.1
# mkfile 200m /files/file.2
# mkfile 200m /files/file.3
# mkfile 200m /files/file.4
# cd /files
# zpool create tank-1 raidz1 file.1 file.2 file.3 file.4
cannot open 'file.1': no such device in /dev/dsk
must be a full path or shorthand device name
# zpool create tank-1 raidz1 /files/file.1
/files/file.2 /files/file.3 /files/file.4
Fault a disk in tank-1:
# zpool status tank-1
pool: tank-1
state: DEGRADED
status: One or more devices could not be opened. Sufficient replicas
exist for
the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
see: http://www.sun.com/msg/ZFS-8000-2Q
scan: scrub repaired 0 in 0h0m with 0 errors on Fri Oct 8 09:20:36 2010
config:
NAME STATE READ WRITE CKSUM
tank-1 DEGRADED 0 0 0
raidz1-0 DEGRADED 0 0 0
/files/file.1 UNAVAIL 0 0 0 cannot open
/files/file.2 ONLINE 0 0 0
/files/file.3 ONLINE 0 0 0
/files/file.4 ONLINE 0 0 0
# zpool export tank-1
# zpool import tank-1
cannot import 'tank-1': no such pool available
# zpool import -d /files tank-1
On 10/07/10 17:41, Hans-Christian Otto wrote:
Hi,
I've been playing around with zfs for a few days now, and now ended up with a
faulted raidz (4 disks) with 3 disks still marked as online.
Lets start with the output of zpool import:
pool: tank-1
id: 15108774693087697468
state: FAULTED
status: One or more devices contains corrupted data.
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-8000-5E
config:
tank-1 FAULTED corrupted data
raidz1-0 ONLINE
disk/by-id/dm-name-tank-1-1 UNAVAIL corrupted data
disk/by-id/dm-name-tank-1-2 ONLINE
disk/by-id/dm-name-tank-1-3 ONLINE
disk/by-id/dm-name-tank-1-4 ONLINE
After some google searches and reading http://www.sun.com/msg/ZFS-8000-5E,
it seems to me as if some metadata is lost, and thus the pool cannot be
restored anymore.
I've tried "zpool import -F tank-1" as well as "zpool import -f tank-1", both
resulting in the following message:
cannot import 'tank-1': I/O error
Destroy and re-create the pool from
a backup source.
What I'm wondering about right now are the following things:
Is there some way to recover the data? I thought raidz would require two disks
to lose the data?
And as I think that the data is lost - why did this happen in the first place?
Which situation can cause a faulted raidz that has only one broken drive?
Greetings,
Christian
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