At the moment I am feverishly seeking advice for how to fix a broken ZFS
raidz2 I have (using FreeBSD 8.2-STABLE).
This is the current status:
$ zpool status
pool: tank
state: FAULTED
status: One or more devices could not be opened. There are insufficient
replicas for the pool to continue functioning.
action: Attach the missing device and online it using 'zpool online'.
see: http://www.sun.com/msg/ZFS-8000-3C
scan: scrub repaired 0 in 49h3m with 2 errors on Fri Jan 20 15:10:35 2012
config:
NAME STATE READ WRITE CKSUM
tank FAULTED 0 0 2
raidz2-0 DEGRADED 0 0 8
da0 ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
da3 ONLINE 0 0 0
3758301462980058947 UNAVAIL 0 0 0 was /dev/da4
da5 ONLINE 0 0 0
The strange thing is that the pool is FAULTED while its part is merely
DEGRADED.
da4 failed reccently and was replaced with a new disk, but no resilvering is
taking place.
I've already tried lots of things with this, including exporting and
then "zpool import -nFX tank". (I only got it back-imported with "zpool
import -V tank). The -nFX ("extreme rewind") option gives no output, but
there is a lot of I/O activity going on, as if it is rewinding forever,
or in a loop, or something like that.
One thing that may, or may not, complicate things is the following.
Already quite a while ago there suddenly was a directory that was so
corrupted that zfs reported I/O errors for various files in it. I could
not even remove them; in the end I moved the other files to a new
directory and put the original directory to the side, and made it mode
000. (If rewinding wants to go back to before this happened, I can
understand that this takes a while, but I left it running overnight and
it didn't make visible progress)
zdb and various other commands complain about the pool not being
available, or I/O errors. For instance:
fourquid.1:~$ sudo zpool clear -nF tank
fourquid.1:~$ sudo zpool clear -F tank
cannot clear errors for tank: I/O error
fourquid.1:~$ sudo zpool clear -nFX tank
(no output, uses some cpu, some I/O)
zdb -v ok
zdb -v -c tank zdb: can't open 'tank': input/output error
zdb -v -l /dev/da[01235] ok
zdb -v -u tank zdb: can't open 'tank': Input/output error
zdb -v -l -u /dev/da[01235] ok
zdb -v -m tank zdb: can't open 'tank': Input/output error
zdb -v -m -X tank no output, uses cpu and I/O
zdb -v -i tank zdb: can't open 'tank': Input/output error
zdb -v -i -F tank zdb: can't open 'tank': Input/output error
zdb -v -i -X tank no output, uses cpu and I/O
Are there any hints you can give me? I have full FreeBSD source online
so I can modify some tools, if needed.
Thanks in advance,
-Olaf.
--
Pipe rene = new PipePicture(); assert(Not rene.GetType().Equals(Pipe));
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