From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: SB700 AHCI causes disk power cycle Date: Mon, 23 Jun 2008 09:28:06 +0900 Message-ID: <485EEE16.1060701@kernel.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:49234 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751805AbYFWA2O (ORCPT ); Sun, 22 Jun 2008 20:28:14 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: wessels Cc: linux-ide@vger.kernel.org Hello, wessels wrote: > Hi, > > I also bought an ASUS M3A78 mATX board with a SB700 to see if it might > solve my problem with the SB600. But it doesn't. > The SB700 shows the same behaviour as the SB600, it periodically > throws an error and the power cycles the disk. > But it always happens on one channel not both. Perhaps a sudden burst > in disk IO causes this but I'm unable to > reproduce this with a synthetic load. Only when vmware is running this > happens. I don't see it when the machine is idling. > The load on the machine is very light both on cpu and disk. Also I > didn't see the error with a single seagate disk attached. > > The error and configuration is the same as mentioned in my earlier > post regarding the "SB600 AHCI causes disk power cycle". > > What I didn't mentioned then was the filesystem layout > two disks in a mirror > /dev/sda & /dev/sdb > no LVM just a software raid via md > md0 /boot ext3 > md1 / ext3 > md2 swap > md3 /usr/local/virtmach XFS > > Please let me know what else I need to log and/or test. >>From your report on sb600. kernel: ata4: SError: { RecovComm Persist PHYRdyChg 10B8B } kernel: ata4.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0 kernel: res 40/00:3c:0d:bd:c9/00:00:0b:00:00/40 Emask 0x10 (ATA bus error) This combined with the incremented start stop count looks very much like the harddisk went offline briefly and came back for whatever reason. I doubt the ahci driver even with its all might can do that. Can you please try to hook up the faulting harddrive to a separate power supply? http://modtown.co.uk/mt/article2.php?id=psumod -- tejun