From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 30 Aug 2001 14:00:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 30 Aug 2001 13:59:50 -0400 Received: from host154.207-175-42.redhat.com ([207.175.42.154]:48633 "EHLO lacrosse.corp.redhat.com") by vger.kernel.org with ESMTP id ; Thu, 30 Aug 2001 13:59:30 -0400 Message-ID: <3B8E7F0D.3000503@redhat.com> Date: Thu, 30 Aug 2001 13:59:41 -0400 From: Doug Ledford User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.3+) Gecko/20010829 X-Accept-Language: en-us MIME-Version: 1.0 To: "Kevin P. Fleming" CC: linux-kernel@vger.kernel.org Subject: Re: 2.4.9-ac1 RAID-5 resync causes PPP connection to be unusable In-Reply-To: <05c501c13178$43e19ba0$6caaa8c0@kevin> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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 http://people.redhat.com/dledford Please check my web site for aic7xxx updates/answers before e-mailing me about problems