You might try setting zfs_scrub_limit to 1 or 2 and attach a customer
service record to :
6494473 ZFS needs a way to slow down resilvering
-r
Le 7 oct. 09 à 06:14, John a écrit :
Hi,
We are running b118, with a LSI 3801 controller which is connected
to 44 drives (yes it's a lot behind a single controller). We also
use a pair of ssd connected to another controller for read cache.
Everything works fine and we achieve acceptable performance for our
needs.
However, during scrubbing or resilvering operations, it seems ZFS
generates so much traffic that it overwhelmes the controller. The
controller then logs the following errors:
Oct 6 07:30:04 nas101 scsi: [ID 107833 kern.warning] WARNING: /
p...@0,0/pci8086,6...@4/pci1000,3...@0/s...@16,0 (sd19):
Oct 6 07:30:04 nas101incomplete read- retrying
Is there anything that can be done to slow down zfs operations such
as resilvering/scrubbing? We tried tuning zfs:zfs_vdev_max_pending
but it did not really help.
This is a bit frustrating because this configuration works well to
serve data. It's just too aggressive when the kernel accesses drives
for some operations.
Iostat looks liks this:
r/sw/s kr/s kw/s wait actv wsvc_t asvc_t %w %b s/w h/w
trn tot device
9681.5 37.3 116403.3 35.1 0.0 30.20.03.1 0 1000 0
21 8 29 c9
420.31.5 5058.21.4 0.0 1.30.03.1 0 44 0
0 0 0 c9t8d0
Any help would be appreciated.
thanks,
JJ
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