You may already know this, or you may have discovered it (as I did)
through trial and error, but if you're using mdadm it is advisable to
compile mdadm with the same compiler as the kernel.
I was using an mdadm compiled with gcc 2.96 on a gcc 3.2-compiled 2.4.19
kernel, and getting very strange errors. I looked at the kernel and
mdadm code, but couldn't see any bugs. Finally, I realized that I must
be seeing structure alignment differences between the two compilers. I
recompiled mdadm with gcc 3.2 and voila, everything works now...
--
Paul
sophocles:~ # cat /proc/version
Linux version 2.4.19-md-64GB-SMP (clemep@fenric) (gcc version 3.2
20020903 (Red Hat Linux 8.0 3.2-7)) #1 SMP Thu May 1 16:01:16 EDT 2003
[output from md driver PRINT_RAID_DEBUG ioctl:]
Jun 16 20:53:18 sophocles kernel: md: rdev hda5: O:hda5, SZ:02104320 F:0
DN:0
Jun 16 20:53:18 sophocles kernel: md: rdev superblock:
Jun 16 20:53:18 sophocles kernel: md: SB: (V:0.90.0)
ID:<d6c5272a.dba72f74.4425
6768.25075ca6> CT:3e9d9217
Jun 16 20:53:18 sophocles kernel: md: L5 S02104320 ND:3 RD:3 md0
LO:2 CS:131
072
Jun 16 20:53:18 sophocles kernel: md: UT:3ee5de36 ST:0 AD:3 WD:3
FD:0 SD:0 C
SUM:426a1dc5 E:000026bf
Jun 16 20:53:18 sophocles kernel: D 0:
DISK<N:0,hda5(3,5),R:0,S:6>
Jun 16 20:53:18 sophocles kernel: D 1:
DISK<N:1,hda6(3,6),R:1,S:6>
Jun 16 20:53:18 sophocles kernel: D 2:
DISK<N:2,hda7(3,7),R:2,S:6>
Jun 16 20:53:18 sophocles kernel: md: THIS:
DISK<N:0,hda5(3,5),R:0,S:6>
Jun 16 20:53:18 sophocles kernel: md:
**********************************
Jun 16 20:53:18 sophocles kernel:
[gcc 2.96-compiled mdadm:]
sophocles:~ # mdadm --examine /dev/hda5 | tail -12
Spare Devices : 0
Checksum : 426a1dc5 - expected 814ffbfe
Events : 9919.0
Layout : left-asymmetric
Chunk Size : 0K
Number Major Minor RaidDevice State
this 0 0 0 3 faulty sync
0 0 0 0 3 faulty sync
1 0 0 1 3 active sync
2 0 0 2 3 faulty active sync
[gcc 3.2-compiled mdadm:]
sophocles:~ # /export/public/clemep/tmp/mdadm --examine /dev/hda5 | tail
-12
Spare Devices : 0
Checksum : 426a1dc5 - correct
Events : 9919.0
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 3 5 0 active sync /dev/hda5
0 0 3 5 0 active sync /dev/hda5
1 1 3 6 1 active sync /dev/hda6
2 2 3 7 2 active sync /dev/hda7
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