Hello,
I have a question about ZFS-8000-8A and block volumes.
I have 2 mirror sets in one zpool.
Build 134 amd64 (upgraded since it was released from 2009.06)
Pool version is still 13
pool: data
state: DEGRADED
status: One or more devices has experienced an error resulting in data
corruption. Applications may be affected.
action: Restore the file in question if possible. Otherwise restore the
entire pool from backup.
see: http://www.sun.com/msg/ZFS-8000-8A
scrub: scrub completed after 4h16m with 2 errors on Fri Sep 17 13:19:04 2010
config:
NAME STATE READ WRITE CKSUM
data DEGRADED 0 0 28
mirror-0 DEGRADED 0 0 56
c0t0d0 DEGRADED 0 0 56 too many errors
c9t0d0 DEGRADED 0 0 56 too many errors
mirror-1 ONLINE 0 0 0
c0t1d0 ONLINE 0 0 0
c9t1d0 ONLINE 0 0 0
errors: Permanent errors have been detected in the following files:
data/zlun02:<0x1>
data/zlun03:<0x1>
I SAN boot my systems and this block volume is a windows install, windows boot
and run fine. it does however indicate that the disk has a bad block in event
viewer. I have been running this setup since build 99 and boot CentOS, win2k8
and Vista/7 from it.
ZFS is now unable to get data from the mirror but was able to write it before,
so I assume this is either a controller/system fault, disk fault or a ZFS
fault? Could a client side FC driver/HBA fault cause this?
I did a full scrub of the pool twice. 1st only zlun02 showed up. then I
accessed zlun03 via the windows 7 install running on zlun02 and now it shows as
a problem also.
The system also run 2 virtual CentOS machines from this pool "data". I also
have a samba share configured and data is accessed sometimes heavily from it
and no problems so far for anything else.
All other pools are also fine on the system
The system has been running for 64 days (uptime) no ungraceful shutdown on
either the server or the system accessing the block volume and then the
problems started.
I did a full shutdown and power on, did a zpool clear and did a scrub. Still it
remains.
My real question here is how can I make a backup/move of the block volume
zlun02 via ZFS or is this impossible. Due to licensing on some software it is a
real nightmare to reinstall (once I found out what the problem is)
I tried making a snapshot of the fs and tried to use zfs send/recv, but this
fails as can be expected.
Any ideas would be welcomed.
Also if anyone knows of a tool I can use to test the disk(s) without causing
damage to zfs please post, offline online does not matter any tool that has
been tested with ZFS on an affected disk.
Needles to say these disks are under heavy load and it could be that I am real
unlucky for it to fail at the same time. I even split each mirror set between 2
controllers.
I have 4 disks spare (cold), but I do not know what the result would be to
replace each disk. I assume the rebuild/resilver will fail since not all data
is available anymore.
Thanks,
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