Hi!
On Feb 1, 2012, at 7:43 PM, Bob Friesenhahn wrote:
> On Wed, 1 Feb 2012, Jan Hellevik wrote:
>> The disk in question is c6t70d0 - it shows consistently higher %b and asvc_t
>> than the other disks in the pool. The output is from a 'zfs receive' after
>> about 3 hours.
>> The two c5dx disks are the 'rpool' mirror, the others belong to the 'backup'
>> pool.
>
> Are all of the disks the same make and model? What type of chassis are the
> disks mounted in? Is it possible that the environment that this disk
> experiences is somehow different than the others (e.g. due to vibration)?
They are different makes - I try to make pairs of different brands to minimise
risk.
The disks are in a Rackable Systems enclosure (disk shelf?). 16 disks, all
SATA. Connected to a SASUC8I controller on the server.
This is a backup server I recently put together to keep backups from my main
server. I put in the disks from the old 'backup' pool and have started a 2TB
zfs send/receive from my main server. So far thing look ok, it is just the
somewhat high values on that one disk that worries me a little.
>
>> Should I be worried? And what other commands can I use to investigate
>> further?
>
> It is difficult to say if you should be worried.
>
> Be sure to do 'iostat -xe' to see if there are any accumulating errors
> related to the disk.
>
This is the most current output from iostat. It has been running a zfs receive
for more than a day. No errors. zpool status also reports no errors.
extended device statistics ---- errors ---
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b s/w h/w trn tot
device
8.1 18.7 142.5 180.4 0.0 0.1 0.1 3.2 0 8 0 0 0 0
c5d0
10.2 18.7 186.3 180.4 0.0 0.1 0.1 3.3 0 9 0 0 0 0
c5d1
0.0 36.7 0.0 3595.8 0.0 0.1 0.0 3.2 0 9 0 0 0 0
c6t66d0
0.0 36.0 0.0 3642.2 0.0 0.1 0.0 3.9 0 12 0 0 0 0
c6t70d0
0.0 36.1 0.0 3642.2 0.0 0.1 0.0 2.9 0 5 0 0 0 0
c6t74d0
0.0 39.6 0.0 4071.8 0.0 0.0 0.0 0.7 0 2 0 0 0 0
c6t76d0
0.2 0.0 0.3 0.0 0.0 0.0 0.0 0.0 0 0 0 0 0 0
c6t77d0
0.2 36.8 0.3 3595.8 0.0 0.1 0.0 1.9 0 4 0 0 0 0
c6t78d0
0.2 0.0 0.3 0.0 0.0 0.0 0.0 0.0 0 0 0 0 0 0
c6t79d0
0.2 39.6 0.3 4071.6 0.0 0.1 0.0 1.6 0 5 0 0 0 0
c6t80d0
0.2 0.0 0.3 0.0 0.0 0.0 0.0 0.0 0 0 0 0 0 0
c6t81d0
admin@master:/export/home/admin$ zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
backup 4.53T 2.17T 2.36T 47% 1.00x ONLINE -
admin@master:/export/home/admin$ zpool status
pool: backup
state: ONLINE
scan: scrub repaired 0 in 5h7m with 0 errors on Tue Jan 31 04:55:31 2012
config:
NAME STATE READ WRITE CKSUM
backup ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c6t78d0 ONLINE 0 0 0
c6t66d0 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
c6t70d0 ONLINE 0 0 0
c6t74d0 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
c6t76d0 ONLINE 0 0 0
c6t80d0 ONLINE 0 0 0
errors: No known data errors
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