From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: raid 5 mismatch_cnt errors Date: Wed, 26 May 2010 11:07:26 -0400 Message-ID: <4BFD392E.3030906@tmr.com> References: <4BF56B1F.9080205@locallinux.com> <20100521071645.497cdcad@notabene.brown> <4BF5B7D1.3070808@locallinux.com> <20100521083819.54680dfb@notabene.brown> <4BF5ECE7.7020907@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4BF5ECE7.7020907@redhat.com> Sender: linux-raid-owner@vger.kernel.org To: Doug Ledford Cc: Neil Brown , Trey Scarborough , "linux-raid@vger.kernel.org" List-Id: linux-raid.ids Doug Ledford wrote: > On 05/20/2010 06:38 PM, Neil Brown wrote: > >> On Thu, 20 May 2010 17:29:37 -0500 >> Trey Scarborough wrote: >> >> >>> Neil Brown wrote: >>> >>>> On Thu, 20 May 2010 12:02:23 -0500 >>>> Trey Scarborough wrote: >>>> >>>> >>>> >>>>> I have a raid 5 array with 9 disks and I have a mismatch_cnt that keeps >>>>> growing. This is causing file corruption on the underlaying file systems >>>>> as well. I can copy a group of 100 100mb files and then do a md5sum on >>>>> them and 1-3 will be corrupt. If this is a drive that is bad is there >>>>> anyway to run a report on the count per drive that these mismatches >>>>> occur. I have run smarttools test and do not see one drive that stands >>>>> out to be causing errors. Could something else be causing these errors? >>>>> >>>>> > > While a bad drive is certainly a possibility here, this is precisely the > type of failure scenario that would make me suspect bad RAM, > motherboard, or CPU. So I wouldn't rule those out as possibilities either. > I have the same thought, I would remove half the RAM from the system and test again, then swap to the "other" half and repeat. Of course running memtest first is a good idea, but I have seen failures which only happen on disk access. If the system is O/C obviously the first step is to cut the speed back... -- Bill Davidsen "We can't solve today's problems by using the same thinking we used in creating them." - Einstein