Hi folks,
At home I run OpenSolaris x86 with a 4 drive Raid-Z (4x1TB) zpool and it's not
in great shape. A fan stopped spinning and soon after the top disk failed
(cause you know, heat rises). Naturally, OpenSolaris and ZFS didn't skip a
beat; I didn't even notice it was dead until I saw the disk activity LED stuck
on nearly a week later.
So I decided I would attach the disks to 2nd system (with working fans) where I
could backup the data to tape. So here's where I got dumb...I ran 'zpool
export'. Of course, I never actually ended up attaching the disks to another
machine, but ever since that export I've been unable to import the pool at all.
I've ordered a replacement 1TB disk, but it hasn't arrived yet. Since I got no
errors from the scrub I ran while the array was degraded, I'm pretty confident
that the remaining 3 disks have valid data.
* Should I be able to import a degraded pool?
* If not, shouldn't there be a warning when exporting a degraded pool?
* If replace 1TB dead disk with a blank disk, might the import work?
* Are there any tools (or commercial services) for ZFS recovery?
I read a blog post (which naturally now I can't find) where someone in similar
circumstances was able to import his pool after restoring /etc/zfs/zpool.cache
from a backup before the 'zpool export'. Naturally this guy was doing it with
ZFS-FUSE under Linux, so it's another step removed, but can someone explain to
me the logic & risks of trying such a thing? Will it work if the zpool.cache
comes from 1day/1week/1month old backup?
So here's what I get...
pe...@pickle:~$ pfexec zpool import
pool: andre
id: 5771661786439152324
state: FAULTED
status: One or more devices are missing from the system.
action: The pool cannot be imported. Attach the missing
devices and try again.
see: http://www.sun.com/msg/ZFS-8000-3C
config:
andre FAULTED corrupted data
raidz1 DEGRADED
c5t0d0 ONLINE
c5t1d0 ONLINE
c5t2d0 ONLINE
c5t3d0 UNAVAIL cannot open
Any constructive suggestions would be greatly appreciated.
Thanks
--Peter
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