Hi
Why would the superblock magic be zero on a newly created RAID-1 set?
I get this error when the kernel (2.6.17.7) boots:
md: Autodetecting RAID arrays.
md: invalid raid superblock magic on sda1, found 0x0 not 0xa92b4efc
md: sda1 has invalid sb, not importing!
md: invalid raid superblock magic on sda2, found 0x0 not 0xa92b4efc
md: sda2 has invalid sb, not importing!
md: invalid raid superblock magic on sdb1, found 0x0 not 0xa92b4efc
md: sdb1 has invalid sb, not importing!
md: invalid raid superblock magic on sdb2, found 0x0 not 0xa92b4efc
md: sdb2 has invalid sb, not importing!
md: autorun ...
md: ... autorun DONE.
(I modified md.c so that it prints out "found xxxx not 0xa92b4efc")
I have a monolithic kernel, compiled for RAID-1.
Once the system is up and running, mdadm brings up the RAID arrays fine:
# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda2[0] sdb2[1]
506036 blocks super 1.0 [2/2] [UU]
md0 : active raid1 sda1[0]
312062456 blocks super 1.0 [2/1] [U_]
unused devices: <none>
It is deliberately degraded, so that I can boot until I fix this problem.
# dpkg -l mdadm | grep mdadm
ii mdadm 2.5.3.git200608202239-7 tool to administer Linux MD arrays
(software RAID)
I've re-created the RAID set a couple of times just to make sure that I
did it correctly. Here's how:
mdadm -C /dev/md0 --level=raid1 --raid-devices=2 /dev/sda1 missing
As I understand it, this can't be an issue with my config files, because
the error occurs *before* the filesystem is mounted.
# fdisk -l /dev/sd[a-z]
Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 38850 312062593+ fd Linux raid
autodetect
/dev/sda2 38851 38913 506047+ fd Linux raid
autodetect
Disk /dev/sdb: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 38850 312062593+ fd Linux raid
autodetect
/dev/sdb2 38851 38913 506047+ fd Linux raid
autodetect
Some info about the (brand new) disks:
# hdparm -I /dev/sda
ATA device, with non-removable media
Model Number: WDC WD3200YS-01PGB0
Serial Number: WD-WCAPD2664999
Firmware Revision: 21.00M21
Standards:
Supported: 7 6 5 4
Likely used: 7
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 625142448
device size with M = 1024*1024: 305245 MBytes
device size with M = 1000*1000: 320072 MBytes (320 GB)
Many thanks,
Thomas
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