From: "Roger Lucas" <roger@planbit.co.uk>
To: 'Sevrin Robstad' <quackyo@start.no>
Cc: linux-raid@vger.kernel.org
Subject: RE: bad performance on RAID 5
Date: Sat, 20 Jan 2007 10:18:28 -0000 [thread overview]
Message-ID: <000901c73c7c$5404cb00$8001a8c0@wolverine> (raw)
In-Reply-To: <Pine.LNX.4.64.0701181731080.3052@twinlark.arctic.org>
Hi Sevrin,
Are you sure all the disks are working OK?
We saw a problem here with a 4-disk SATA array. The array was working
without errors but was _very_ slow. When we checked each disk individually,
we found one disk was reporting SMART errors and running slow. We removed
it and replaced it with a new disk and the RAID array ran at full speed
again. Further tests on the removed disk found that it was having a lot of
problems but just about hanging in there (although taking a long time for
each operation) - hence the RAID array didn't mark it as faulty.
I would check the SMART logs with smartctl to see if anything looks a bit
wrong and try benchmarking the disks individually too.
- Roger
prev parent reply other threads:[~2007-01-20 10:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-17 21:33 bad performance on RAID 5 Sevrin Robstad
2007-01-17 22:38 ` Justin Piszcz
2007-01-18 9:06 ` Raz Ben-Jehuda(caro)
2007-01-18 18:20 ` Sevrin Robstad
2007-01-18 19:56 ` Raz Ben-Jehuda(caro)
2007-01-18 23:01 ` Bill Davidsen
2007-01-18 18:19 ` Sevrin Robstad
2007-01-18 19:02 ` Mark Hahn
2007-01-18 20:47 ` Sevrin Robstad
2007-01-18 18:29 ` Steve Cousins
2007-01-18 20:43 ` Sevrin Robstad
2007-01-18 23:10 ` Bill Davidsen
2007-01-21 17:08 ` Nix
2007-01-21 19:09 ` Bill Davidsen
2007-01-19 1:33 ` dean gaudet
2007-01-20 10:18 ` Roger Lucas [this message]
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