From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Subject: Re: Bad sectors on a degraded array Date: Mon, 10 Jan 2011 08:42:43 +0100 Message-ID: <20110110084243.370821zsnjv03bfo@cakebox.homeunix.net> References: <20110108124953.GA8241@r00t3d.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2; DelSp="Yes"; format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110108124953.GA8241@r00t3d.com> Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: FLD Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids See if these are "real" read errors, errors that the OS will see (dd if=/dev/sdX of=/dev/null bs=1M). If yes, get another disk and duplicate the problematic disk using dd_rescue and use the new one instead of the old one. Once the array is up again make sure to do a raid check in regular intervals. Kind regards, Alex. ----- Message from fld@r00t3d.com --------- Date: Sat, 8 Jan 2011 14:49:53 +0200 From: FLD Subject: Bad sectors on a degraded array To: linux-raid@vger.kernel.org > While waiting for my RMA'd disk to return I noticed that one device in > my degraded (4 out of 5) raid5 has developed some bad sectors: > 1 Raw_Read_Error_Rate 0x002f 200 200 051 - 0 > 196 Reallocated_Event_Count 0x0032 200 200 000 - 0 > 197 Current_Pending_Sector 0x0032 200 200 000 - 3 > 198 Offline_Uncorrectable 0x0030 200 200 000 - 3 > > I did some Self-test'ing and got some errors: > # 1 Extended offline Completed: read failure 50% 6640 > 1158803416 > # 2 Short offline Completed without error 00% 6637 > # 3 Extended offline Completed: read failure 50% 6634 > 1158820656 > > At this point those bad secotrs haven't caused any harm or errors in > dmesg while the array is mounted r/w and being used. What I'm wondering > is what kind of steps should I take once the RMA replacement arrives? > I know md doesn't like read errors very much and I'm thinking with smart > output like that it's very likely theres gonna be some read errors during > rebuild? > > According to smartmontool documentation this is a pretty common situation > for a hard disk. There's a nice tutorial how to fix errors like this at: > http://smartmontools.sourceforge.net/badblockhowto.html , so I wonder if > I should --stop the array and try to manually fix the bad sectors before > I try rebuilding? > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > ----- End message from fld@r00t3d.com ----- ======================================================================== # _ __ _ __ http://www.nagilum.org/ \n icq://69646724 # # / |/ /__ ____ _(_) /_ ____ _ nagilum@nagilum.org \n +491776461165 # # / / _ `/ _ `/ / / // / ' \ Amiga (68k/PPC): AOS/NetBSD/Linux # # /_/|_/\_,_/\_, /_/_/\_,_/_/_/_/ Mac (PPC): MacOS-X / Linux / MacOS-X # # /___/ x86: FreeBSD/Linux/Solaris/Win2k ARM9: EPOC EV6 # ======================================================================== ---------------------------------------------------------------- cakebox.homeunix.net - all the machine one needs..