From: Chris Webb <chris@arachsys.com>
To: Tejun Heo <tj@kernel.org>
Cc: Neil Brown <neilb@suse.de>, Ric Wheeler <rwheeler@redhat.com>,
Andrei Tanas <andrei@tanas.ca>,
linux-kernel@vger.kernel.org,
IDE/ATA development list <linux-ide@vger.kernel.org>,
linux-scsi@vger.kernel.org, Jeff Garzik <jgarzik@redhat.com>,
Mark Lord <mlord@pobox.com>
Subject: Re: MD/RAID time out writing superblock
Date: Fri, 18 Sep 2009 18:07:42 +0100 [thread overview]
Message-ID: <20090918170742.GJ2141@arachsys.com> (raw)
In-Reply-To: <4AB2596D.10809@kernel.org>
Tejun Heo <tj@kernel.org> writes:
> Chris Webb wrote:
>
> > Would such very slow (but ultimately successful) flushes be
> > consistent with the theory of power supply issues affecting the
> > drives? It feels like the 30s timeouts on flush could be just a more
> > severe version of the 15s very slow flushes.
>
> Probably not. Power problems usually don't resolve themselves with
> longer timeout. If the drive genuinely takes longer than 30s to
> flush, it would be very interesting tho. That's something people have
> been worrying about but hasn't materialized yet. The timeout is
> controlled by SD_TIMEOUT in drivers/scsi/sd.h. You might want to bump
> it up to, say, 60s and see whether anything changes.
I'll add that to the list of things to check out on the test machine with a
more disposable installation on it! The 15s flushes we're seeing on
superblock barrier writes do already feel dangerously close to the 30s
hardcoded timeout to me: it's only a factor of two.
Cheers,
Chris.
next prev parent reply other threads:[~2009-09-18 17:07 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-26 0:32 MD/RAID: what's wrong with sector 1953519935? Andrei Tanas
2009-08-26 0:50 ` NeilBrown
2009-08-26 1:06 ` Ric Wheeler
2009-08-26 1:24 ` NeilBrown
2009-08-26 1:31 ` Ric Wheeler
2009-08-26 2:22 ` Andrei Tanas
2009-08-26 2:41 ` Ric Wheeler
2009-08-26 3:45 ` Andrei Tanas
2009-08-26 10:34 ` Ric Wheeler
2009-08-26 14:46 ` Andrei Tanas
2009-08-26 14:49 ` Andrei Tanas
2009-08-26 15:39 ` Ric Wheeler
2009-08-26 18:12 ` Andrei Tanas
2009-08-26 18:12 ` Andrei Tanas
2009-08-27 0:07 ` Mark Lord
2009-08-27 1:37 ` Andrei Tanas
2009-08-27 1:37 ` Andrei Tanas
2009-08-27 2:33 ` Robert Hancock
2009-08-27 21:22 ` MD/RAID time out writing superblock Andrei Tanas
2009-08-27 21:57 ` Ric Wheeler
2009-08-31 8:10 ` Tejun Heo
2009-08-31 12:04 ` Ric Wheeler
2009-08-31 12:20 ` Tejun Heo
2009-09-07 11:44 ` Chris Webb
2009-09-07 11:59 ` Chris Webb
2009-09-09 12:02 ` Chris Webb
2009-09-14 7:41 ` Tejun Heo
2009-09-14 7:44 ` Tejun Heo
2009-09-14 12:48 ` Mark Lord
2009-09-14 13:05 ` Tejun Heo
2009-09-14 14:25 ` Mark Lord
2009-09-16 23:19 ` Chris Webb
2009-09-17 13:29 ` Mark Lord
2009-09-17 13:32 ` Mark Lord
2009-09-17 13:37 ` Chris Webb
2009-09-17 15:35 ` Tejun Heo
2009-09-17 16:16 ` Mark Lord
2009-09-17 16:17 ` Mark Lord
2009-09-18 17:05 ` Chris Webb
2009-09-20 17:35 ` Allan Wind
2009-09-28 5:32 ` Allan Wind
2009-09-21 10:26 ` Chris Webb
2009-09-21 19:47 ` Mark Lord
2009-09-22 6:16 ` Robert Hancock
2009-09-20 18:36 ` Robert Hancock
2009-09-14 13:11 ` Henrique de Moraes Holschuh
2009-09-14 13:24 ` Tejun Heo
2009-09-14 14:02 ` Henrique de Moraes Holschuh
2009-09-14 14:34 ` Tejun Heo
2009-09-14 13:14 ` Gabor Gombas
2009-09-07 16:55 ` Allan Wind
2009-09-07 16:55 ` Allan Wind
2009-09-07 23:26 ` Thomas Fjellstrom
2009-09-07 23:26 ` Thomas Fjellstrom
2009-09-14 7:46 ` Tejun Heo
2009-09-14 21:13 ` Thomas Fjellstrom
2009-09-14 22:23 ` Tejun Heo
2009-09-16 22:28 ` Chris Webb
2009-09-16 23:47 ` Tejun Heo
2009-09-17 0:34 ` Neil Brown
2009-09-17 12:00 ` Chris Webb
2009-09-17 11:57 ` Chris Webb
2009-09-17 15:44 ` Tejun Heo
2009-09-17 16:36 ` Allan Wind
2009-09-18 0:16 ` Tejun Heo
2009-09-18 2:47 ` Allan Wind
2009-09-18 17:07 ` Chris Webb [this message]
2009-09-20 18:46 ` Robert Hancock
2009-09-21 0:02 ` Kyle Moffett
2009-09-17 13:35 ` Mark Lord
2009-09-17 15:47 ` Tejun Heo
2009-08-31 12:21 ` Mark Lord
2009-08-31 23:45 ` Mark Lord
2009-09-01 13:07 ` Andrei Tanas
2009-09-01 13:07 ` Andrei Tanas
2009-09-01 13:15 ` Mark Lord
2009-09-01 13:30 ` Tejun Heo
2009-09-01 13:47 ` Ric Wheeler
2009-09-01 14:18 ` Andrei Tanas
2009-09-01 14:18 ` Andrei Tanas
2009-09-14 5:30 ` Marc Giger
2009-09-14 5:30 ` Marc Giger
2009-09-02 21:58 ` Allan Wind
2009-09-04 19:39 ` Andrei Tanas
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