On one of our servers, we have a RAIDz1 ZFS pool called 'maths2'
consisting of 7 x 300 Gb disks which in turn contains a single ZFS
filesystem called 'home'.
Yesterday, using the 'ls' command to list the directories within this pool
caused the command to hang for a long period period followed by an 'i/o
error' message. 'zpool status -x maths2' reports the pool is healthy but
'iostat -en' shows a rather different story:
root@e450:~# iostat -en
---- errors ---
s/w h/w trn tot device
0 0 0 0 fd0
0 0 0 0 c2t3d0
0 0 0 0 c2t0d0
0 0 0 0 c2t1d0
0 0 0 0 c5t3d0
0 0 0 0 c4t0d0
0 0 0 0 c4t1d0
0 0 0 0 c2t2d0
0 0 0 0 c4t2d0
0 0 0 0 c4t3d0
0 0 0 0 c5t0d0
0 0 0 0 c5t1d0
0 0 0 0 c8t0d0
0 0 0 0 c8t1d0
0 0 0 0 c8t2d0
0 503 1658 2161 c9t0d0
0 2515 6260 8775 c9t1d0
0 0 0 0 c8t3d0
0 492 2024 2516 c9t2d0
0 444 1810 2254 c9t3d0
0 0 0 0 c5t2d0
0 1 0 1 rmt/2
Obviously it looks like controller c9 or the cabling associated with it is
in trouble (the server is an Enterprise 450 with multiple disk
controllers). On taking the server down and running the 'probe-scsi-all'
command from the OBP, one disk c9t1d0 was reported as being faulty (no
media present) but the others seemed fine.
After booting back up, I started scrubbing the maths2 pool and for a long
time, only disk c9t1d0 reported it was being repaired. After a few hours,
another disk on this controller reported being repaired:
NAME STATE READ WRITE CKSUM
maths2 ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
c5t2d0 ONLINE 0 0 0
c5t3d0 ONLINE 0 0 0
c8t3d0 ONLINE 0 0 0
c9t0d0 ONLINE 0 0 0 21K repaired
c9t1d0 ONLINE 0 0 0 938K repaired
c9t2d0 ONLINE 0 0 0
c9t3d0 ONLINE 0 0 0
errors: No known data errors
Now, does this point to a controller/cabling/backplane problem or could
all 4 disks on this controller have been corrupted in some way? The O/S is
Osol snv_134 for SPARC and the server has been up & running for nearly a
year with no problems to date - there are two other RAIDz1 pools on this
server but these are working fine.
Andy
---------------------------------
Andy Thomas,
Time Domain Systems
Tel: +44 (0)7866 556626
Fax: +44 (0)20 8372 2582
http://www.time-domain.co.uk
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