----- Original Message -----
From: "Doug Ledford" <dledford@redhat.com>
To: "Kevin P. Fleming" <kevin@labsysgrp.com>
Cc: <linux-kernel@vger.kernel.org>
Sent: Thursday, August 30, 2001 10:59 AM
Subject: Re: 2.4.9-ac1 RAID-5 resync causes PPP connection to be unusable
> 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
>
>
>
>
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