From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: possible data corruption on ICH8 or WD raptor Date: Fri, 01 Aug 2008 13:29:07 +0900 Message-ID: <48929113.4020402@kernel.org> References: <0b8b01c8e5fb$65ed9480$0400a8c0@dcccs> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:44660 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751745AbYHAE3h (ORCPT ); Fri, 1 Aug 2008 00:29:37 -0400 In-Reply-To: <0b8b01c8e5fb$65ed9480$0400a8c0@dcccs> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Janos Haar Cc: linux-ide@vger.kernel.org Janos Haar wrote: > Hello list, > > I have one (planned) production ready server with DP35DP Intel > motherboard, and 6 drive. > > 2x 500GB WD SATA (not interesting) > 4x 300GB WD Velociraptor, SATA2 > > When i have tested the server i see one error report on the dmesg: > > ata3.00: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xa frozen > ata3.00: irq_stat 0x00400040, connection status changed > ata3: SError: { PHYRdyChg DevExch } > ata3.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0 > res 40/00:20:40:de:90/00:00:07:00:00/40 Emask 0x10 (ATA bus error) You're getting PHY event on flush which is a pretty strong indication that you're having power problem. The disk goes out to transfer data in its buffer to the platter and draws more power from the cable. For some reason, power is not maintained properly. Disk checks out momentarily causing the PHY event and losing the data in its buffer. Try to connect the harddrive to a separate PSU and see whether the problem goes away. -- tejun