From: Doug Ledford <dledford@redhat.com>
To: "Kevin P. Fleming" <kevin@labsysgrp.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4.9-ac1 RAID-5 resync causes PPP connection to be unusable
Date: Thu, 30 Aug 2001 13:59:41 -0400 [thread overview]
Message-ID: <3B8E7F0D.3000503@redhat.com> (raw)
In-Reply-To: <05c501c13178$43e19ba0$6caaa8c0@kevin>
Kevin P. Fleming wrote:
> I ran into a very strange problem yesterday... my server here, which is a
> 700 MHz Celeron, 256MiB RAM, four ~40G disks has two RAID-5 arrays (using
> the standard kernel MD driver) configured across those four drives. For some
> reason definitely related to operator error, the machine crashed and needed
> to resync the arrays after being rebooted.
>
> Eveything was working fine, interactive response was just fine even though
> the drives were just cranking away doing their resync. I then brought up my
> PPP Internet connection, which came up just fine. However, I was _not_ able
> to actually communicate with any 'Net hosts.
[ snip ]
> I can probably reproduce this pretty easily, if anyone is interested and can
> give me some idea where to look for the cause...
Don't bother. The problem is that your disks are IDE disks and you
don't have IRQ unmasking enabled on some/all of them. As long as that's
the case, heavy disk activity (whether it's a RAID5 resync or a bonnie
run or untar'ing a kernel archive) will always cause your PPP connection
to quit working due to dropped serial data and therefore corrupted PPP
packets.
--
Doug Ledford <dledford@redhat.com> http://people.redhat.com/dledford
Please check my web site for aic7xxx updates/answers before
e-mailing me about problems
next prev parent reply other threads:[~2001-08-30 18:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-30 17:21 2.4.9-ac1 RAID-5 resync causes PPP connection to be unusable Kevin P. Fleming
2001-08-30 17:59 ` Doug Ledford [this message]
2001-08-31 4:23 ` Kevin P. Fleming
2001-08-31 15:31 ` Andreas Dilger
2001-08-31 15:43 ` Martin Josefsson
-- strict thread matches above, loose matches on Subject: below --
2001-08-31 2:12 Samium Gromoff
2001-08-31 16:02 david
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