Measure the I/O performance with iostat. You should see something that
looks sorta like (iostat -zxCn 10):
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
5948.9 349.3 40322.3 5238.1 0.1 16.7 0.0 2.7 0 330 c9
3.7 0.0 230.7 0.0 0.0 0.1 0.0 13.5 0 2 c9t1d0
845.0 0.0 5497.4 0.0 0.0 0.9 0.0 1.1 1 32 c9t2d0
3.8 0.0 230.7 0.0 0.0 0.0 0.0 10.6 0 1 c9t3d0
845.2 0.0 5495.4 0.0 0.0 0.9 0.0 1.1 1 32 c9t4d0
3.8 0.0 237.1 0.0 0.0 0.0 0.0 10.4 0 1 c9t5d0
841.4 0.0 5519.7 0.0 0.0 0.9 0.0 1.1 1 32 c9t6d0
3.8 0.0 237.3 0.0 0.0 0.0 0.0 9.2 0 1 c9t7d0
843.5 0.0 5485.2 0.0 0.0 0.9 0.0 1.1 1 31 c9t8d0
3.7 0.0 230.8 0.0 0.0 0.1 0.0 15.2 0 2 c9t9d0
850.2 0.0 5488.6 0.0 0.0 0.9 0.0 1.1 1 31 c9t10d0
3.1 0.0 211.2 0.0 0.0 0.0 0.0 13.2 0 1 c9t11d0
847.9 0.0 5523.4 0.0 0.0 0.9 0.0 1.1 1 31 c9t12d0
3.1 0.0 204.9 0.0 0.0 0.0 0.0 9.6 0 1 c9t13d0
847.2 0.0 5506.0 0.0 0.0 0.9 0.0 1.1 1 31 c9t14d0
3.4 0.0 224.1 0.0 0.0 0.0 0.0 12.3 0 1 c9t15d0
0.0 349.3 0.0 5238.1 0.0 9.9 0.0 28.4 1 100 c9t16d0
Here you can clearly see a raidz2 resilver in progress. c9t16d0
is the disk being resilvered (write workload) and half of the
others are being read to generate the resilvering data. Note
the relative performance and the ~30% busy for the surviving
disks. If you see iostat output that looks significantly different
than this, then you might be seeing one of two common causes:
1. Your version of ZFS has the new resilver throttle *and* the
pool is otherwise servicing I/O.
2. Disks are throwing errors or responding very slowly. Use
fmdump -eV to observe error reports.
-- richard
On Nov 1, 2010, at 12:33 PM, Mark Sandrock wrote:
> Hello,
>
> I'm working with someone who replaced a failed 1TB drive (50% utilized),
> on an X4540 running OS build 134, and I think something must be wrong.
>
> Last Tuesday afternoon, zpool status reported:
>
> scrub: resilver in progress for 306h0m, 63.87% done, 173h7m to go
>
> and a week being 168 hours, that put completion at sometime tomorrow night.
>
> However, he just reported zpool status shows:
>
> scrub: resilver in progress for 447h26m, 65.07% done, 240h10m to go
>
> so it's looking more like 2011 now. That can't be right.
>
> I'm hoping for a suggestion or two on this issue.
>
> I'd search the archives, but they don't seem searchable. Or am I wrong about
> that?
>
> Thanks.
> Mark (subscription pending)
>
>
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss@opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
--
ZFS and performance consulting
http://www.RichardElling.com
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