Read Error Not Correctable Raid
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Add. Sense: Unrecovered Read Error - Auto Reallocate Failed
Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: hdparm make bad sector Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How can you force linux software raid not to disable a disk for recovery? up vote 1 down vote favorite I'm hdparm repair-sector trying to recover data from a RAID5 array. 2 of my 4 disks unexpectedly failed at the same time. I am able to start the array by forcing it. mdadm --assemble --scan --force The array starts up ckean but degraded root@omv:~# mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Wed Apr 18 22:03:46 2012 Raid Level : raid5 Array Size : 8790795264 (8383.56 GiB 9001.77 GB) Used Dev Size : 2930265088 (2794.52 GiB 3000.59 GB) Raid Devices : 4
Sense Key : Medium Error [current]
Total Devices : 3 Persistence : Superblock is persistent Update Time : Mon Aug 25 23:50:44 2014 State : clean, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Name : omv:data (local to host omv) UUID : 157604ce:9206dd99:c8d249be Events : 21524 Number Major Minor RaidDevice State 4 8 16 0 active sync /dev/sdb 1 0 0 1 removed 2 8 32 2 active sync /dev/sdc 3 8 48 3 active sync /dev/sdd I proceed to mound the file system in read only mode. The read errors eventually result in the device being dropped from the array. Is there a way I can force it to not to be dropped. I'd like to be able to copy off what I can. [ 190.250032] end_request: I/O error, dev sdc, sector 1234525616 [ 190.250082] raid5:md0: read error not correctable (sector 1234525616 on sdc). [ 190.250086] raid5: Disk failure on sdc, disabling device. [ 190.250088] raid5: Operation continuing on 2 devices. [ 190.250195] ata5: EH complete [ 190.366679] Buffer I/O error on device md0, logical block 462946358 [ 190.366723] lost page write due to I/O error on md0 [ 192.873263] ata5.00: exception Emask 0x0 SAct 0xf SErr 0x0 action 0x0 [ 192.873308] ata5.00: irq_stat 0x40000008 [ 192.873348] ata5.00: failed command: READ FPDMA QUEUED [ 192.873392] ata5.00: cmd 60/10:00:00:dc:3c/00:00:57:00:00/40 tag 0 ncq 8192 in [ 192.873394] res 41/40:10:00:dc:3c/00:00:57:00:00/00 Emask 0x409 (
and only cause some noise in your syslog. In most cases the disk will automatically reallocate one or two damaged hdparm yes i know what i am doing sectors and you should start planning on buying a new disk while hdparm pending sector your data is safe. However, sometimes the disk won't automatically reallocate these sectors and you'll have to do
Unhandled Sense Code
that manually yourself. Luckily, this doesn't include any rocket science. A few days ago, one of my disks reported some problems in my syslog while rebuilding a RAID5-array: Jan 29 http://serverfault.com/questions/623937/how-can-you-force-linux-software-raid-not-to-disable-a-disk-for-recovery 18:19:54 dragon kernel: [66774.973049] end_request: I/O error, dev sdb, sector 1261069669 Jan 29 18:19:54 dragon kernel: [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] http://www.sj-vs.net/forcing-a-hard-disk-to-reallocate-bad-sectors/ 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: [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
Registered: 2006-03-31 Posts: 575 [SOLVED] mdadm / RAID trouble Hi all,In relation to this post: Migrating data to a "new" setup, questionsI https://bbs.archlinux.org/viewtopic.php?id=106919 think I've a problem with my new RAID5 array everything seemed http://askubuntu.com/questions/569142/mdadm-raid-5-array-with-2-failed-drives to work fine, I was transferring stuff to it, which went ok. Then I reduced the old 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. read error 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 change from 4000795590656 to 0md: md0 stopped.md: unbind
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes 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 Mdadm Raid 5 Array with 2 Failed Drives up vote 1 down vote favorite 1 My setup is as follows /dev/sdb/ /dev/sdc/ /dev/sdd/ /dev/sdf/ I have the following 4 1.5TB drives in a mdadm raid 5 array. One of the disks (sdb) died on me leading the array to start up running in degraded mode. No problem I thought as this is the whole reason I setup a raid 5 array in the first place. I had a spare blank 1.5tb disk to replace the dead sdb disk, so I formatted it and added it into the array. However this is where the problem really starts. When recovering the array after adding a fresh disk the recovery fails every single time, though not always at the same percentage. After recovery fails sdc is marked as a failed device and also removed from the array though it can be forced to be added again. Here's some of the outputs from syslog Jan 5 01:16:28 serverlol kernel: [11303.917452] md/raid:md0: Disk failure on sdc1, disabling device. Jan 5 01:16:28 serverlol mdadm[3345]: Fail event detected on md device /dev/md0, component device /dev/sdc1 Here's the output of syslog when the failure occurs Jan 5 01:16:24 serverlol kernel: [11300.853422] end_request: I/O error, dev sdc, sector 693768801 Jan 5 01:16:24 serverlol kernel: [11300.853426] md/raid:md0: read error not correctable (sector 693766752 on sdc1). Jan 5 01:16:24 serverlol kernel: [11300.853429] md/raid:md0: read error not correctable (sector 693766760 on sdc1). Jan 5 01:16:24 serverlol kernel: [11300.853432] md/raid:md0: read error not correctable (sector 693766768 on sdc1). Jan 5 01:16:24 serverlol kernel: [11300.853434] md