On Mon, 7 May 2012 23:41:34 -0700 "D. Lin" <dlbulk-mllr@xxxxxxxxx> wrote: > Thanks for your help. > > > > > Would it be equally accurate to say that it didn't happen when you were > > running ubunutu 11.10?? My point is that maybe the important change is > > not in the kernel. > > > > My system was running 11.04 when things worked. I skipped 11.10. > > > > What do you have in /etc/mdadm.conf ? (or maybe /etc/mdadm/mdadm.conf) > > # egrep -v '^#|^$' /etc/mdadm/mdadm.conf > DEVICE partitions > CREATE owner=root group=disk mode=0660 auto=yes > HOMEHOST <system> > > > > If you stop the array, then > > > > mdadm -Asvvv > > > > what messages are generated, and what is the result? > > > > root@anguish:/# mdadm --misc --stop /dev/md0 > mdadm: stopped /dev/md0 > > [195415.073137] md0: detected capacity change from 4000789299200 to 0 > [195415.073150] md: md0 stopped. > [195415.073166] md: unbind<sdc1> > [195415.092175] md: export_rdev(sdc1) > [195415.092210] md: unbind<sdd1> > [195415.092413] md: export_rdev(sdd1) > [195415.092533] md: unbind<sdb1> > [195415.104245] md: export_rdev(sdb1) > > > # mdadm -Asvvv > mdadm: looking for devices for further assembly > mdadm: no RAID superblock on /dev/sdd > mdadm: no RAID superblock on /dev/sdc > mdadm: no RAID superblock on /dev/sdb > mdadm: /dev/sdd1 is identified as a member of /dev/md/disc:0, slot 1. > mdadm: /dev/sdc1 is identified as a member of /dev/md/disc:0, slot 0. > mdadm: /dev/sdb1 is identified as a member of /dev/md/disc:0, slot 2. > mdadm: added /dev/sdd1 to /dev/md/disc:0 as 1 > mdadm: added /dev/sdb1 to /dev/md/disc:0 as 2 > mdadm: added /dev/sdc1 to /dev/md/disc:0 as 0 > mdadm: /dev/md/disc:0 has been started with 3 drives. > mdadm: looking for devices for further assembly > mdadm: looking for devices for further assembly > mdadm: no recogniseable superblock on /dev/md/disc:0 > mdadm: cannot open device /dev/sdd1: Device or resource busy > mdadm: cannot open device /dev/sdd: Device or resource busy > mdadm: cannot open device /dev/sdc1: Device or resource busy > mdadm: cannot open device /dev/sdc: Device or resource busy > mdadm: cannot open device /dev/sdb1: Device or resource busy > mdadm: cannot open device /dev/sdb: Device or resource busy > > root@anguish:/# cat /proc/mdstat > Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] > [raid4] [raid10] > md127 : active raid5 sdc1[4] sdb1[3] sdd1[2] > 3907020800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] > [UUU] > bitmap: 0/15 pages [0KB], 65536KB chunk > > unused devices: <none> > > > please note that the md device is now md127, as opposed to md0. When > 2.6.38 was running, md127 was auto discovered. > > > Now, I reboot the system. md0 is auto discovered and degraded. > > [ 1.649849] md: linear personality registered for level -1 > [ 1.658472] md: multipath personality registered for level -4 > [ 1.665077] md: raid0 personality registered for level 0 > [ 1.669855] md: raid1 personality registered for level 1 > [ 1.869347] md: bind<sdd1> > [ 2.157297] md: bind<sdb1> > [ 2.168850] md: raid6 personality registered for level 6 > [ 2.168923] md: raid5 personality registered for level 5 > [ 2.168999] md: raid4 personality registered for level 4 > [ 2.352210] md: raid10 personality registered for level 10 > [ 2.378106] md/raid:md0: device sdb1 operational as raid disk 2 > [ 2.378158] md/raid:md0: device sdd1 operational as raid disk 1 > [ 2.378503] md/raid:md0: allocated 3228kB > [ 2.378629] md/raid:md0: raid level 5 active with 2 out of 3 devices, > algorithm 2 > [ 2.378939] created bitmap (15 pages) for device md0 > [ 2.379386] md0: bitmap initialized from disk: read 1/1 pages, set 0 of > 29809 bits > [ 2.401485] md0: detected capacity change from 0 to 4000789299200 > [ 2.410364] md0: unknown partition table > > > $ cat /proc/mdstat > Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] > [raid4] [raid10] > md0 : active raid5 sdb1[3] sdd1[2] > 3907020800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] > [_UU] > bitmap: 7/15 pages [28KB], 65536KB chunk > > Thanks for the extra detail. Everything looks sensible so far. Can you check the contents of mdadm.conf on the initrd please. e.g. cd /tmp zcat /boot/initrd | cpio -idv cat etc/mdadm/mdadm.conf something like that. NeilBrown
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