Read Error Not Correctable
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and only cause some noise in your syslog. In most cases the disk will automatically reallocate one or two damaged sectors and you should start planning on buying hdparm read-sector a new disk while your data is safe. However, sometimes the disk won't automatically add. sense: unrecovered read error - auto reallocate failed reallocate these sectors and you'll have to do that manually yourself. Luckily, this doesn't include any rocket science. A few
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days ago, one of my disks reported some problems in my syslog while rebuilding a RAID5-array: Jan 29 18:19:54 dragon kernel: [66774.973049] end_request: I/O error, dev sdb, sector 1261069669 Jan 29 18:19:54 dragon kernel:
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[66774.973054] raid5:md3: read error not correctable (sector 405431640 on sdb6). Jan 29 18:19:54 dragon kernel: [66774.973059] raid5: Disk failure on sdb6, disabling device. Jan 29 18:20:11 dragon kernel: [66792.180513] sd 3:0:0:0: [sdb] Unhandled sense code Jan 29 18:20:11 dragon kernel: [66792.180516] sd 3:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE Jan 29 18:20:11 dragon kernel: [66792.180521] sd 3:0:0:0: [sdb] Sense Key : Medium Error [current] [descriptor] Jan 29 18:20:11 dragon kernel: sense key : medium error [current] [66792.180547] sd 3:0:0:0: [sdb] Add. Sense: Unrecovered read error - auto reallocate failed Jan 29 18:20:11 dragon kernel: [66792.180553] sd 3:0:0:0: [sdb] CDB: Read(10): 28 00 4b 2a 6c 4c 00 00 c0 00 Jan 29 18:20:11 dragon kernel: [66792.180564] end_request: I/O error, dev sdb, sector 1261071601 Modern hard disk drives are equipped with a small amount of spare sectors to reallocate damaged sectors. However, a sector only gets relocated when a write operation fails. A failing read operation will, in most cases, only throw an I/O error. In the unlikely event a second read does succeed, some disks perform a auto-reallocation and data is preserved. In my case, the second read failed miserably ("Unrecovered read error - auto reallocate failed"). The read errors were caused by a sync of a new RAID5 array, which was initially running in degraded mode (on /dev/sdb and /dev/sdc, with /dev/sdd missing). Obviously, mdadm kicked sdb out of the already degraded RAID5-array, leaving nothing but sdc. That's not something to be very happy about… The only solution to this problem, was to force sdb to dynamically relocate the damaged sectors. That way, mdadm wouldn't encounter the read errors and the initial sync of the array would suc
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Meta Discuss the workings and policies of this site About Us hdparm pending sector Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us unhandled sense code Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes http://www.sj-vs.net/forcing-a-hard-disk-to-reallocate-bad-sectors/ a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top What steps should I take to best attempt to recover a failed software raid5 setup? up vote 4 down vote favorite My raid has failed, and I'm not sure what http://serverfault.com/questions/598955/what-steps-should-i-take-to-best-attempt-to-recover-a-failed-software-raid5-setu the best steps to take are in order to best attempt to recover it. I've got 4 drives in a raid5 configuration. It seems as if one has failed (sde1), but md can't bring the array up because it says sdd1 is not fresh Is there anything I can do to recover the array? I've pasted below some excerpts from /var/log/messages and mdadm --examine: /var/log/messages $ egrep -w sd[b,c,d,e]\|raid\|md /var/log/messages nas kernel: [...] sd 5:0:0:0: [sde] nas kernel: [...] sd 5:0:0:0: [sde] CDB: nas kernel: [...] end_request: I/O error, dev sde, sector 937821218 nas kernel: [...] sd 5:0:0:0: [sde] killing request nas kernel: [...] md/raid:md0: read error not correctable (sector 937821184 on sde1). nas kernel: [...] md/raid:md0: Disk failure on sde1, disabling device. nas kernel: [...] md/raid:md0: Operation continuing on 2 devices. nas kernel: [...] md/raid:md0: read error not correctable (sector 937821256 on sde1). nas kernel: [...] sd 5:0:0:0: [sde] Unhandled error code nas kernel: [...] sd 5:0:0:0: [sde] nas kernel: [...] sd 5:0:0:0: [sde] CDB: nas kernel: [...] end_re
Registered: 2006-03-31 Posts: 575 [SOLVED] mdadm / RAID trouble Hi all,In relation to this post: Migrating data to a "new" setup, questionsI think I've a problem with my new RAID5 array everything seemed to work fine, https://bbs.archlinux.org/viewtopic.php?id=106919 I was transferring stuff to it, which went ok. Then I reduced the old http://www.linuxquestions.org/questions/linux-server-73/raid-5-quits-re-syncing-with-read-error-4175439493/ fs on /home (which held everything) to the minimum size ~2.3TB, and pvmove:ed a partition off it so I could add it to the RAID array. After unmounting the raid to do an fsck, something happened (though it didn't say!), it's like the RAID array just disappeared.Here's the dmesg: http://dpaste.org/1oUi/ snippet below:md0: detected capacity read error change from 4000795590656 to 0md: md0 stopped.md: unbind
HCL Search Reviews Search ISOs Go to Page... LinuxQuestions.org > Forums > Linux Forums > Linux - Server RAID 5 quits re-syncing with read error User Name Remember Me? Password Linux - Server This forum is for the discussion of Linux Software used in a server related context. Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today! Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. Are you new to LinuxQuestions.org? Visit the following links: Site Howto | Site FAQ | Sitemap | Register Now If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here. Having a problem logging in? Please visit this page to clear all LQ-related cookies. Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Click Here to receive this Complete Guide absolutely free. Search this Thread 11-30-2012, 02:34 PM #1 88fingerslukee LQ Newbie Registered: Nov 2012 Posts: 1 Rep: RAID 5 quits re-syncing with re