Hi, what does say:
cat /proc/mdstat This happened on running system? The root is still running fine I suppose. Try run smartctl test on both drives. And do not rebuild or recreate md before you do not know all information, you can terribly broke your root. Robert. On Sun, 23 Dec 2012 12:20:48 +0000 Alan Mackenzie <a...@muc.de> wrote: > On Sat, Dec 22, 2012 at 03:24:53PM +0100, Volker Armin Hemmann wrote: > > Am Samstag, 22. Dezember 2012, 13:53:42 schrieb Alan Mackenzie: > > > Hi, all. > > > > Just built kernel 3.6.11 and when I tried to install it with > > > lilo, I got this difficult error message: > > > > Fatal: Trying to map files from unnamed device 0x0000 > > > (NFS/RAID mirror down ?) > > > > . So I eventually had a look at dmesg for my raid setup, and > > > found this > > > - note lines 15 - 19: > > > > [ 2.148410] md: Waiting for all devices to be available > > > before autodetect > > > [ 2.149891] md: If you don't use raid, use > > > raid=noautodetect [ 2.151546] md: Autodetecting RAID arrays. > > > [ 2.180356] md: Scanned 4 and added 4 devices. > > > [ 2.181819] md: autorun ... > > > [ 2.183244] md: considering sdb6 ... > > > [ 2.184666] md: adding sdb6 ... > > > [ 2.186079] md: sdb3 has different UUID to sdb6 > > > [ 2.187492] md: adding sda6 ... > > > [ 2.188884] md: sda3 has different UUID to sdb6 > > > [ 2.190484] md: created md6 > > > [ 2.191883] md: bind<sda6> > > > [ 2.193224] md: bind<sdb6> > > > [ 2.194538] md: running: <sdb6><sda6> > > > 15 [ 2.195855] md: kicking non-fresh sda6 from array! > > > 16 [ 2.197154] md: unbind<sda6> > > > 17 [ 2.205840] md: export_rdev(sda6) > > > [ 2.207176] bio: create slab <bio-1> at 1 > > > 19 [ 2.208520] md/raid1:md6: active with 1 out of 2 mirrors > > > [ 2.209835] md6: detected capacity change from 0 to > > > 34359672832 [ 2.211187] md: considering sdb3 ... > > > [ 2.212444] md: adding sdb3 ... > > > [ 2.213691] md: adding sda3 ... > > > [ 2.215117] md: created md3 > > > [ 2.216349] md: bind<sda3> > > > [ 2.217569] md: bind<sdb3> > > > [ 2.218765] md: running: <sdb3><sda3> > > > [ 2.220025] md/raid1:md3: active with 2 out of 2 mirrors > > > [ 2.221231] md3: detected capacity change from 0 to > > > 429507543040 [ 2.222508] md: ... autorun DONE. > > > [ 2.230821] md6: unknown partition table > > > > . Further perusal of a log file showed this error first happened > > > on 2012-11-29. It would appear /dev/md6 has been firing on one > > > cylinder ever since, and I've been unaware of this. :-( > > > > What does it mean for sda6 to be "non-fresh"? > > > > /dev/md6 is my root partition (including /usr :-(), so I can't > > > unmount it for investigation. > > > > Could somebody please suggest how I might go about repairing this > > > problem. > > > boot from systemrescuecd > > mdadm -S /dev/md6 > > mdadm -A /dev/md6 > > This didn't quite work, since mdadm -A merely restarted the array > without the non-fresh partition. Still it got me searching, and what > eventually worked was mdadm /dev/md6 -a /dev/sda6. (Where -a stands > for "add".) The mdadm man page is very vague for this use case. > > > > get some coffee. Make some popcorn. The resync will take some while. > > Indeed it did. The coffee settled me down somewhat. Thanks again! >
