On Tue, 7 May 2013 00:35:10 +0100 Ricky <rickyorbixx@xxxxxxxxx> wrote: > Hello everybody, > > First time posting to this list, so please forgive any oversights with > etiquette and missing information and such. > > I've not long recovered a Raid-5 array compromising of 4 disks with 2 > failing (not failed) disks, with a 1-by-1 swap-out of new matching > disks. I did this with a live CD and the data was totally fine, > mountable, no issues at all. > > Then I go to boot it back up, and kernel output shows that only 2 of the > 4 disks could be brought up and the raid could naturally not be brought > online, resulting in obvious failure. I panic, go back to the live CD, > but nope, the raid is totally fine according to all the output. > > I spoke to a friendly person on freenode's ##linux who suggested > checking if all disks including the new ones were using the 0.9 > superblock that my older disks were, I jumped the gun a bit and decided > to upgrade them all to 1.0, only to find the kernel of the system on > disk did not have a version of md that supports that new superblock, so > I downgraded it. I performed this by offlining the array and recreating > it based on the output of --detail but specifically passing the > superblock parameter, as per your Wiki instructions, still no good > however. Didn't mess up the recreation as the partition still totally > accessible via the live CD. > > It's at this point that I'm stuck, I've no idea what to do next and hope > you can advise. Details below: > > System: CentOS 5.9, kernel 2.6.34.6 You probably need to find someone who knows something about the boot sequence of Centos. Maybe you need to create a new initrd with a new mdadm.conf in it. Or maybe you just need to install grub onto the mbr or something. NeilBrown > > mdadm --examine /dev/sd*2 > /dev/sda2: > Magic : a92b4efc > Version : 0.90.00 > UUID : 06dc023e:47dbfdaa:a4d2adc2:26fd5302 (local to host > localhost) > Creation Time : Mon May 6 23:45:15 2013 > Raid Level : raid5 > Used Dev Size : 1462512576 (1394.76 GiB 1497.61 GB) > Array Size : 4387537728 (4184.28 GiB 4492.84 GB) > Raid Devices : 4 > Total Devices : 4 > Preferred Minor : 0 > > Update Time : Mon May 6 23:47:24 2013 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > Checksum : bdf0c5f1 - correct > Events : 1 > > Layout : left-symmetric > Chunk Size : 64K > > Number Major Minor RaidDevice State > this 0 8 2 0 active sync /dev/sda2 > > 0 0 8 2 0 active sync /dev/sda2 > 1 1 8 18 1 active sync /dev/sdb2 > 2 2 8 34 2 active sync /dev/sdc2 > 3 3 8 50 3 active sync /dev/sdd2 > /dev/sdb2: > Magic : a92b4efc > Version : 0.90.00 > UUID : 06dc023e:47dbfdaa:a4d2adc2:26fd5302 (local to host > localhost) > Creation Time : Mon May 6 23:45:15 2013 > Raid Level : raid5 > Used Dev Size : 1462512576 (1394.76 GiB 1497.61 GB) > Array Size : 4387537728 (4184.28 GiB 4492.84 GB) > Raid Devices : 4 > Total Devices : 4 > Preferred Minor : 0 > > Update Time : Mon May 6 23:47:24 2013 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > Checksum : bdf0c603 - correct > Events : 1 > > Layout : left-symmetric > Chunk Size : 64K > > Number Major Minor RaidDevice State > this 1 8 18 1 active sync /dev/sdb2 > > 0 0 8 2 0 active sync /dev/sda2 > 1 1 8 18 1 active sync /dev/sdb2 > 2 2 8 34 2 active sync /dev/sdc2 > 3 3 8 50 3 active sync /dev/sdd2 > /dev/sdc2: > Magic : a92b4efc > Version : 0.90.00 > UUID : 06dc023e:47dbfdaa:a4d2adc2:26fd5302 (local to host > localhost) > Creation Time : Mon May 6 23:45:15 2013 > Raid Level : raid5 > Used Dev Size : 1462512576 (1394.76 GiB 1497.61 GB) > Array Size : 4387537728 (4184.28 GiB 4492.84 GB) > Raid Devices : 4 > Total Devices : 4 > Preferred Minor : 0 > > Update Time : Mon May 6 23:47:24 2013 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > Checksum : bdf0c615 - correct > Events : 1 > > Layout : left-symmetric > Chunk Size : 64K > > Number Major Minor RaidDevice State > this 2 8 34 2 active sync /dev/sdc2 > > 0 0 8 2 0 active sync /dev/sda2 > 1 1 8 18 1 active sync /dev/sdb2 > 2 2 8 34 2 active sync /dev/sdc2 > 3 3 8 50 3 active sync /dev/sdd2 > /dev/sdd2: > Magic : a92b4efc > Version : 0.90.00 > UUID : 06dc023e:47dbfdaa:a4d2adc2:26fd5302 (local to host > localhost) > Creation Time : Mon May 6 23:45:15 2013 > Raid Level : raid5 > Used Dev Size : 1462512576 (1394.76 GiB 1497.61 GB) > Array Size : 4387537728 (4184.28 GiB 4492.84 GB) > Raid Devices : 4 > Total Devices : 4 > Preferred Minor : 0 > > Update Time : Mon May 6 23:47:24 2013 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > Checksum : bdf0c627 - correct > Events : 1 > > Layout : left-symmetric > Chunk Size : 64K > > Number Major Minor RaidDevice State > this 3 8 50 3 active sync /dev/sdd2 > > 0 0 8 2 0 active sync /dev/sda2 > 1 1 8 18 1 active sync /dev/sdb2 > 2 2 8 34 2 active sync /dev/sdc2 > 3 3 8 50 3 active sync /dev/sdd2 > > mdadm --detail /dev/md0 > /dev/md0: > Version : 0.90 > Creation Time : Mon May 6 23:45:15 2013 > Raid Level : raid5 > Array Size : 4387537728 (4184.28 GiB 4492.84 GB) > Used Dev Size : 1462512576 (1394.76 GiB 1497.61 GB) > Raid Devices : 4 > Total Devices : 4 > Preferred Minor : 0 > Persistence : Superblock is persistent > > Update Time : Mon May 6 23:47:24 2013 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > > Layout : left-symmetric > Chunk Size : 64K > > UUID : 06dc023e:47dbfdaa:a4d2adc2:26fd5302 (local to host > localhost) > Events : 0.1 > > Number Major Minor RaidDevice State > 0 8 2 0 active sync /dev/sda2 > 1 8 18 1 active sync /dev/sdb2 > 2 8 34 2 active sync /dev/sdc2 > 3 8 50 3 active sync /dev/sdd2 > > Many thanks in advance for any advice you have, > Ricky Burgin > -- > 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
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