On Sun, 09 Jan 2011 22:32:01 +0100 Vladimir 'Ï-coder/phcoder' Serbinenko <phcoder@xxxxxxxxx> wrote: > On 01/09/2011 09:55 PM, NeilBrown wrote: > > On Sat, 8 Jan 2011 17:53:07 -0500 (EST) Matthew Gabeler-Lee > > <cheetah@xxxxxxxxxxxxxxxxxxx> wrote: > > > > > >> On Sat, 8 Jan 2011, Vladimir 'Ï-coder/phcoder' Serbinenko wrote: > >> > >> > >>> As was recommended I forward the remaining part to linux-raid mailing list. > >>> In short: on his system mdraid, raid5, 4 devices, metadata (presumably) > >>> 0.90, two devices have index 0. > >>> > > What do you mean by "two devices have index 0" ??? I could see nothing in any > > of the posts you sent that could be interpreted that way. > > > > > Sorry, I forgot this part: > grub-core/disk/raid.c:699: Scanning for RAID devices on disk hd2 > grub-core/kern/disk.c:245: Opening `hd2'... > ./grub-probe: info: the size of hd2 is 1465149168. > error: found two disks with the number 0. > grub-core/kern/disk.c:330: Closing `hd2'. > > Trouble comes from followint part: > $ sudo mdadm --examine /dev/sdb > /dev/sdb: > Magic : a92b4efc > Version : 0.90.03 > UUID : 9364f7a2:d74695d5:7d8db3a0:3b5f9e48 > Creation Time : Mon Mar 27 14:03:04 2006 > Raid Level : raid1 > Used Dev Size : 979840 (957.04 MiB 1003.36 MB) > Array Size : 979840 (957.04 MiB 1003.36 MB) > Raid Devices : 2 > Total Devices : 3 > Preferred Minor : 0 > > Update Time : Thu Jan 8 00:34:39 2009 > State : clean > Active Devices : 2 > Working Devices : 3 > Failed Devices : 0 > Spare Devices : 1 > Checksum : 5b8134eb - correct > Events : 9446738 > So sdb as whole pretends to be a part of the following array: > $ sudo mdadm -QD /dev/md0 > /dev/md0: > Version : 0.90 > Creation Time : Mon Mar 27 14:03:04 2006 > Raid Level : raid1 > Array Size : 2008000 (1961.27 MiB 2056.19 MB) > Used Dev Size : 2008000 (1961.27 MiB 2056.19 MB) > Raid Devices : 4 > Total Devices : 4 > Preferred Minor : 0 > Persistence : Superblock is persistent > > Update Time : Sat Jan 8 18:35:47 2011 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > > UUID : 9364f7a2:d74695d5:7d8db3a0:3b5f9e48 > Events : 0.10758124 > > Number Major Minor RaidDevice State > 0 8 17 0 active sync /dev/sdb1 > 1 8 33 1 active sync /dev/sdc1 > 2 8 1 2 active sync /dev/sda1 > 3 8 49 3 active sync /dev/sdd1 > > > As you can see there is a stalled superblock approximately 2 years old. > I don't know if it's some kind of freak accident or operator error. If > it's later then probably zero-filling over stalled superblock will solve > the problems > Simply running mdadm --zero-superblock /dev/sdb should fix it. NeilBrown
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