From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: /dev/md2 stopped after changing SAS controller Date: Sat, 14 May 2011 10:03:44 -0500 Message-ID: <4DCE99D0.1010900@hardwarefreak.com> References: <20110513202900.GA1926@apartia.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110513202900.GA1926@apartia.fr> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 5/13/2011 3:29 PM, Louis-David Mitterrand wrote: > I've been having very bad performance with an LSISAS2008 controller > attached to 8 WD Caviar Black 1TB disks. What is the nature of this 'very bad performance'? Did you recently upgrade kernel/driver and run into a regression? If not, either the HBA has developed a circuit defect, or the problem lies elsewhere, either a backplane/cabling issue, or a drive going south. Do you have any log entries showing problems with the LSI HBA? Drive errors? What does smartctl tell you about each drive? Usually when HBAs fail, they fail, period. They don't typically show continuously degrading performance until totally failing. I'll be interested to know if swapping the LSI for the Adaptec fixes the 'very bad performance' issue. -- Stan