From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Goryachev Subject: Re: Howto avoid full re-sync Date: Mon, 10 Sep 2012 09:11:54 +1000 Message-ID: <504D223A.6020707@websitemanagers.com.au> References: <50497AE6.2010005@websitemanagers.com.au> <81BAA7A8-B1C3-49A1-A600-A9D9D8279E30@bj-ig.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <81BAA7A8-B1C3-49A1-A600-A9D9D8279E30@bj-ig.de> Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids On 09/07/2012 07:41 PM, Ralf M=FCller wrote: > Am 07.09.2012 um 06:41 schrieb Adam Goryachev: > >> I have a MD raid6 with 5 drives, and every now and then one (random) >> drive will fail. I've done all sorts of checks, and the drive is >> actually working fine, so I suspect an issue with the Linux driver >> and/or SATA controller (onboard). >> >> It isn't really relevant to the question, but I'll run through the s= ata >> stuff, in case anyone can point out a simple solution to stop this f= rom >> happening (yes, a new server is on the way, but with budgets etc, th= at >> could be some time away. This issue has happened for years, but we a= re >> becoming more active with these failures now). >> >> 00:0e.0 IDE interface: nVidia Corporation MCP51 Serial ATA Controlle= r >> (rev a1) >> 00:0f.0 IDE interface: nVidia Corporation MCP51 Serial ATA Controlle= r >> (rev a1) >> 01:07.0 RAID bus controller: Silicon Image, Inc. Adaptec AAR-1210SA = SATA >> HostRAID Controller (rev 02) >> >> cat /proc/mdstat >> Personalities : [raid1] [raid6] [raid5] [raid4] >> md2 : active raid6 sdh1[5] sdg1[4] sdf1[0] sdd1[6](F) sde1[2] sda1[1= ] >> 5860535808 blocks level 6, 64k chunk, algorithm 2 [5/4] [UUU_U= ] >> [>....................] recovery =3D 1.4% (28663240/19535119= 36) >> finish=3D486.5min speed=3D65938K/sec >> >> >> >> Since I know sdh is actually almost up to date, is there some way to >> re-add it, and only have to sync the portions of the disk which have >> changed? > > Besides all the stuff about fix your server, a raid is not a backup a= nd you risk your data - simply add a write intent bitmap: > > # mdadm /dev/md2 --grow bitmap=3Dinternal > mdadm /dev/md2 --grow bitmap=3Dinternal mdadm: can only add devices to linear arrays md2 is raid6: md2 : active raid6 sdh1[3] sdg1[4] sdf1[0] sde1[2] sda1[1] 5860535808 blocks level 6, 64k chunk, algorithm 2 [5/5] [UUUUU] Regards, Adam -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html