Dear RAID gurus,
I have a RAID array with two disks operating in linear mode, as per the
following raidtab:
raiddev /dev/md0
raid-level linear
nr-raid-disks 2
nr-spare-disks 0
device /dev/sdb2
raid-disk 0
device /dev/sdc1
raid-disk
This configuration was setup under Redhat 5.2 with raidtools 0.50. The
other day I upgraded the system to RH 6.1 (raidtools 0.90). The array
fails to initialize, and the following messages appear in the syslog:
May 26 10:41:22 cdfrh1 kernel: SCSI device sdc: hdwr sector= 512 bytes. Sectors=
97693755 [47702 MB] [47.7 GB]
May 26 10:41:22 cdfrh1 kernel: sdc: sdc1
May 26 10:41:22 cdfrh1 kernel: autodetecting RAID arrays
May 26 10:41:23 cdfrh1 kernel: (read) sdb2's sb offset: 9052544 [events: 0000000
0]
May 26 10:41:23 cdfrh1 kernel: md: invalid raid superblock magic on sdb2
May 26 10:41:23 cdfrh1 kernel: md: sdb2 has invalid sb, not importing!
May 26 10:41:23 cdfrh1 kernel: could not import sdb2!
May 26 10:41:23 cdfrh1 kernel: autostart sdb2 failed!
May 26 10:41:23 cdfrh1 kernel: bind<sdb2,1>
May 26 10:41:23 cdfrh1 kernel: nonpersistent superblock ...
May 26 10:41:23 cdfrh1 kernel: no chunksize?
May 26 10:41:23 cdfrh1 kernel: bind<sdc1,2>
May 26 10:41:23 cdfrh1 kernel: nonpersistent superblock ...
May 26 10:41:23 cdfrh1 kernel: no chunksize?
May 26 10:41:23 cdfrh1 kernel: sdc1's event counter: 00000000
May 26 10:41:23 cdfrh1 kernel: sdb2's event counter: 00000000
May 26 10:41:23 cdfrh1 kernel: md: bug in file md.c, line 1588
May 26 10:41:23 cdfrh1 kernel:
May 26 10:41:23 cdfrh1 kernel: **********************************
May 26 10:41:23 cdfrh1 kernel: * <COMPLETE RAID STATE PRINTOUT> *
May 26 10:41:23 cdfrh1 kernel: **********************************
May 26 10:41:23 cdfrh1 kernel: md0: <sdc1><sdb2> array superblock:
May 26 10:41:23 cdfrh1 kernel: SB: (V:0.90.0) ID:<c5e95de4.3cc17aee.5e81f108.f
dfb910a> CT:392e8cc8
May 26 10:41:23 cdfrh1 kernel: L-1 S09052627 ND:2 RD:2 md0 LO:0 CS:0
May 26 10:41:23 cdfrh1 kernel: UT:00000000 ST:0 AD:2 WD:2 FD:0 SD:0 CSUM:42
0c5963 E:00000000
May 26 10:41:23 cdfrh1 kernel: D 0: DISK<N:0,sdb2(8,18),R:0,S:6>
May 26 10:41:23 cdfrh1 kernel: D 1: DISK<N:1,sdc1(8,33),R:1,S:6>
(etc. etc.)
I also tried upgrading the configuration using mkraid:
% /sbin/mkraid --upgrade /dev/md0
handling MD device /dev/md0
analyzing super-block
cannot upgrade magic-less superblock on /dev/sdb2 ...
mkraid: aborted, see the syslog and /proc/mdstat for potential clues.
Finally, fsck yields:
/sbin/fsck /dev/md0
Parallelizing fsck version 1.17 (26-Oct-1999)
e2fsck 1.17, 26-Oct-1999 for EXT2 FS 0.5b, 95/08/09
fsck.ext2: Attempt to read block from filesystem resulted in short read
while trying to open /dev/md0
Could this be a zero-length partition?
Can this filesystem be saved, or do I need to blow it away and start
over...?
Thanks for any help you can provide.
Regards,
David Gerdes
--------------------------------------
David Gerdes, University of Michigan
(734) 647-3807 / (734) 936-1817 FAX
[EMAIL PROTECTED]
http://umaxp1.physics.lsa.umich.edu/~gerdes/
