From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.12.11.20060308/8.12.11/SuSE Linux 0.7) with ESMTP id mBB0aRGZ005823 for ; Wed, 10 Dec 2008 18:36:27 -0600 Received: from partygirl.tmr.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 78087C850 for ; Wed, 10 Dec 2008 16:36:23 -0800 (PST) Received: from partygirl.tmr.com (mail.tmr.com [64.65.253.246]) by cuda.sgi.com with ESMTP id Ajxg84Axej31n1TE for ; Wed, 10 Dec 2008 16:36:23 -0800 (PST) Message-ID: <49405A94.8080601@tmr.com> Date: Wed, 10 Dec 2008 19:11:00 -0500 From: Bill Davidsen MIME-Version: 1.0 Subject: Re: Have the velociraptors in a test system now, checkout the errors. References: In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Justin Piszcz Cc: linux-raid@vger.kernel.org, smartmontools-support@lists.sourceforge.net, linux-kernel@vger.kernel.org, xfs@oss.sgi.com Justin Piszcz wrote: > Point of thread: Two problems, mentioned in detail below, NCQ in Linux > when used in a RAID configuration and two, something with how Linux > interacts with the drives causes lots of problems as when I run the WD > tools on the disks, they do not show any errors. > > If anyone has/would like me to run any debugging/patches/etc on this > system feel free to suggest/send me things to try out. After I put > the VR's in a test system, I left NCQ enabled and I made a 10 disk > raid5 to see how fast I could get it to fail, I ran bonnie++ shown > below as a disk benchmark/stress test: > > For the next test I will repeat this one but with NCQ disabled, having > NCQ enabled makes it fail very easily. Then I want to re-run the test > with RAID6. > > bonnie++ -d /r1/test -s 1000G -m p63 -n 16:100000:16:64 > > $ df -h > /dev/md3 2.5T 5.5M 2.5T 1% /r1 > > And the results? Two disk "failures" according to md/Linux within a > few hours as shown below: > > Note, the NCQ-related errors are what I talk about all of the time, if > you use > NCQ and Linux in a RAID environment with WD drives, well-- good luck. > > Two-disks failed out of the RAID5 and I currentlty cannot even 'see' > one of the drives with smartctl, will reboot the host and check sde > again. > > After a reboot, it comes up and has no errors, really makes one wonder > where/what the bugs is/are, there are two I can see: > 1. NCQ issue on at least WD drives in Linux in SW md/RAID > 2. Velociraptor/other disks reporting all kinds of sector errors etc, > but when you use the WD 11.x disk tools program and run all of their > tests it says the disks have no problems whatsoever! The smart > statistics do confirm this. Currently, TLER is on for all disks, for > the duration of these tests. Just a few comments on this, I have several RAID arrays built on Seagate using NCQ, and yet to have a problem. I have NCQ on with my WD drives, non-RAID, and haven't had an issue with them either. The WDs run a lot cooler than the SG, but they are probably getting less use, as well. If the WD are still on sale after the holiday I may grab a few more and run RAID, by then I will have some small sense of trusting them. -- Bill Davidsen "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs