On Thu, 12 Aug 2010 00:01:45 +0200 Stefan /*St0fF*/ Hübner <stefan.huebner@xxxxxxxxxxxxxxxxxx> wrote: > I had exactly the same problem this week with a costumer raid. Solved > it via: > - calculate the hardware block where the Superblock resides > - dd if=/dev/sdXY of=superblock seek=block_of_superblock bs=512 > - hexedit superblock checksum > - dd of=/dev/sdXY if=superblock skip=block_of_superblock bs=512 > > this is not the correct way to go. But noticing that only ONE BIT was > skipped in the checksum, but all the other EXAMINE-information seemed > right, I thought it's the only way to go to get ahold of the data on the > array. I hope you realise that if one bit is wrong in the checksum, it means there is a very good chance that one bit is wrong somewhere else in the superblock. Maybe this was a bit that was ignored. Or maybe not. I guess if you checked the output of --examine very thoroughly you should be safe, but it is worth remembers that the checksum just shows the corruption, it probably isn't the source of the corruption. NeilBrown > > hope it helps, > Stefan > > > Am 10.08.2010 23:35, schrieb Jon Hardcastle: > > Help! > > > > Long story short - I was watching a movie off my RAID6 array. Got a smart error warning > > > > 'Device: /dev/sdc [SAT], ATA error count increased from 30 to 31' > > > > I went to investigate and found: > > > > Error 31 occurred at disk power-on lifetime: 8461 hours (352 days + 13 > > hours) > > > > When the command that caused the error occurred, the device was active > > or idle. > > > > > > > > After command completion occurred, registers were: > > > > ER ST SC SN CL CH DH > > > > -- -- -- -- -- -- -- > > > > 84 51 28 50 bd 49 47 > > > > > > > > Commands leading to the command that caused the error were: > > > > CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name > > > > -- -- -- -- -- -- -- -- ---------------- -------------------- > > > > 61 38 08 3f bd 49 40 08 00:38:33.100 WRITE FPDMA QUEUED > > > > 61 08 00 7f bd 49 40 08 00:38:33.100 WRITE FPDMA QUEUED > > > > 61 08 00 97 bd 49 40 08 00:38:33.000 WRITE FPDMA QUEUED > > > > ea 00 00 00 00 00 a0 08 00:38:33.000 FLUSH CACHE EXT > > > > 61 08 00 bf 4b 38 40 08 00:38:33.000 WRITE FPDMA QUEUED > > > > I then emailed myself some error logs and shut the machine down. This drive has caused me problems before - the last time when the cat knocked the computer over and dislodged the controller card. But several echo "check" sync_action later and several weeks I have not had a peep out of it. > > > > ANYWAYS. after the reboot the array wont assemble (is that normal?) > > > > Aug 10 22:00:07 mangalore kernel: md: running: > > <sdg1><sdf1><sde1><sdd1><sdb1> <sda1> > > > > Aug 10 22:00:07 mangalore kernel: raid5: md4 is not clean -- starting > > background reconstruction > > > > Aug 10 22:00:07 mangalore kernel: raid5: device sdg1 operational as raid > > disk 0 > > > > Aug 10 22:00:07 mangalore kernel: raid5: device sdf1 operational as raid > > disk 6 > > > > Aug 10 22:00:07 mangalore kernel: raid5: device sde1 operational as raid > > disk 2 > > > > Aug 10 22:00:07 mangalore kernel: raid5: device sdd1 operational as raid > > disk 4 > > > > Aug 10 22:00:07 mangalore kernel: raid5: device sdb1 operational as raid > > disk 5 > > > > Aug 10 22:00:07 mangalore kernel: raid5: device sda1 operational as raid > > disk 1 > > > > Aug 10 22:00:07 mangalore kernel: raid5: allocated 7343kB for md4 > > > > Aug 10 22:00:07 mangalore kernel: 0: w=1 pa=0 pr=7 m=2 a=2 r=7 op1=0 > > op2=0 > > > > Aug 10 22:00:07 mangalore kernel: 6: w=2 pa=0 pr=7 m=2 a=2 r=7 op1=0 > > op2=0 > > > > Aug 10 22:00:07 mangalore kernel: 2: w=3 pa=0 pr=7 m=2 a=2 r=7 op1=0 > > op2=0 > > > > Aug 10 22:00:07 mangalore kernel: 4: w=4 pa=0 pr=7 m=2 a=2 r=7 op1=0 > > op2=0 > > > > Aug 10 22:00:07 mangalore kernel: 5: w=5 pa=0 pr=7 m=2 a=2 r=7 op1=0 > > op2=0 > > > > Aug 10 22:00:07 mangalore kernel: 1: w=6 pa=0 pr=7 m=2 a=2 r=7 op1=0 > > op2=0 > > > > Aug 10 22:00:07 mangalore kernel: raid5: cannot start dirty degraded > > array for md4 > > > > Aug 10 22:00:07 mangalore kernel: RAID5 conf printout: > > > > Aug 10 22:00:07 mangalore kernel: --- rd:7 wd:6 > > > > Aug 10 22:00:07 mangalore kernel: disk 0, o:1, dev:sdg1 > > > > Aug 10 22:00:07 mangalore kernel: disk 1, o:1, dev:sda1 > > > > Aug 10 22:00:07 mangalore kernel: disk 2, o:1, dev:sde1 > > > > Aug 10 22:00:07 mangalore kernel: disk 4, o:1, dev:sdd1 > > > > Aug 10 22:00:07 mangalore kernel: disk 5, o:1, dev:sdb1 > > > > Aug 10 22:00:07 mangalore kernel: disk 6, o:1, dev:sdf1 > > > > Aug 10 22:00:07 mangalore kernel: raid5: failed to run raid set md4 > > > > Aug 10 22:00:07 mangalore kernel: md: pers->run() failed ... > > > > Aug 10 22:00:07 mangalore kernel: md: do_md_run() returned -5 > > > > Aug 10 22:00:07 mangalore kernel: md: md4 stopped. > > > > It appears sdc has an invalid superblock? > > > > This is the 'examine' from sdc1 (note the checksum) > > > > /dev/sdc1: > > > > Magic : a92b4efc > > > > Version : 0.90.00 > > > > UUID : 7438efd1:9e6ca2b5:d6b88274: 7003b1d3 > > > > Creation Time : Thu Oct 11 00:01:49 2007 > > > > Raid Level : raid6 > > > > Used Dev Size : 488383936 (465.76 GiB 500.11 GB) > > > > Array Size : 2441919680 (2328.80 GiB 2500.53 GB) > > > > Raid Devices : 7 > > > > Total Devices : 7 > > > > Preferred Minor : 4 > > > > > > > > Update Time : Tue Aug 10 21:39:49 2010 > > > > State : active > > > > Active Devices : 7 > > > > Working Devices : 7 > > > > Failed Devices : 0 > > > > Spare Devices : 0 > > > > Checksum : b335b4e3 - expected b735b4e3 > > > > Events : 1860555 > > > > > > > > Layout : left-symmetric > > > > Chunk Size : 64K > > > > > > > > Number Major Minor RaidDevice State > > > > this 3 8 33 3 active sync /dev/sdc1 > > > > > > > > 0 0 8 97 0 active sync /dev/sdg1 > > > > 1 1 8 1 1 active sync /dev/sda1 > > > > 2 2 8 65 2 active sync /dev/sde1 > > > > 3 3 8 33 3 active sync /dev/sdc1 > > > > 4 4 8 49 4 active sync /dev/sdd1 > > > > 5 5 8 17 5 active sync /dev/sdb1 > > > > 6 6 8 81 6 active sync /dev/sdf1 > > Anyways... I am ASSUMING mdadm has not assembled the array to be on the safe side? i have not done anything.. no force... no assume clean.. I wanted to be sure? > > > > Should i remove sdc1 from the array? It should then assemble? I have 2 spare drives that I am getting around to using to replace this drive and the other 500GB.. so should I remove sdc1... and try and re-add or just put the new drive in? > > > > atm I have 'stop'ped the array and got badblocks running.... > > > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
