From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mikael Andersson Subject: Update: Disk io deadlocks during large-file io Date: Tue, 26 Apr 2005 19:13:31 +0200 Message-ID: <426E76BB.2060201@karett.se> References: <4267F307.8080009@karett.se> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4267F307.8080009@karett.se> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development Cc: axboe@suse.de List-Id: dm-devel.ids With md raid1 instead of dm-mirror i get no lockups during similar workloads or any other workload i've managed to produce. Everything is the same except that i'm using md instead of dm-mirror. >Disk io deadlocks during large-file io. > >During heavy disk io involving creating large files, some parts >of the kernel locks up. In most cases all disk output becomes >impossible, but sometimes you can write small things to disk, like >echo > test.txt might work sometimes. On reiserfs the lockups tend to be >more severe. The problem only occurs when i have both disks in my device >mapper mirror installed. if i remove one of the SATA cables, everything >works perfectly , except that devicemapper complains that the mirror is >degraded. > > See previous mail for complete information about the problem, or feel free to ask me for any further details. I'll try running dm-mirror on two other disks i've got which is on another controller to see if i can reproduce the problem there also. /Mikael Andersson