mdadm: /dev/md3 has wrong uuid.

mdadm: /dev/md3 has wrong uuid.

[Herta Van den Eynde]

I just upgraded my Red Hat Advanced Server 2.1 systems from
2.4.9-e.59enterprise to 2.4.9-e.62enterprise.  The systems were running 
mdadm-1.4.0-1.

During startup, they complained that

md: mount(pid 869) used obsolete MD ioctl, upgrade your software to use 
new ictls.

So I picked up mdadm-1.11.0.tgz,  and on one of the system ran "make" 
and "make install", and rebooted.

This time, startup throws me a bunch of

SCSI device sdc: 71132959 512-byte hdwr sectors (
36420 MB)
sdc: unknown partition table

messages (one for each of the 14 devices).  I had this happen a couple 
of times before, and re-fdisk-ing so far always got me out of the jam. 
So I fdisk all the devices, specifying fd (linux raid autodetect) as type.

Now, it pretty much looks like the UUIDs have been erased.
# mdadm -E -s; echo $?
0
# mdadm -Asv
mdadm: looking for devices for /dev/md3
mdadm: no RAID superblock on /dev/md3
mdadm: /dev/md3 has wrong uuid.
mdadm: no RAID superblock on /dev/md2
mdadm: /dev/md2 has wrong uuid.
mdadm: no RAID superblock on /dev/md1
mdadm: /dev/md1 has wrong uuid.
mdadm: no RAID superblock on /dev/md0
mdadm: /dev/md0 has wrong uuid.
mdadm: no RAID superblock on /dev/md7
mdadm: /dev/md7 has wrong uuid.
mdadm: no RAID superblock on /dev/md6
mdadm: /dev/md6 has wrong uuid.
mdadm: no RAID superblock on /dev/md5
mdadm: /dev/md5 has wrong uuid.
mdadm: no RAID superblock on /dev/sdp1
mdadm: /dev/sdp1 has wrong uuid.
mdadm: no RAID superblock on /dev/sdp
mdadm: /dev/sdp has wrong uuid.

Any suggestions, both for the current system and the other ones?  I got 
backups, but it's a lot of data to pull over, so I'd prefer to avoid 
that if I can.

Kind regards,

Herta
-- 
Herta Van den Eynde              -=- Toledo system management
K.U. Leuven - Ludit              -=- phone: +32 (0)16 322 166
                                  -=- 50°51'27" N 004°40'39" E

"I wish I were two little cats.  Then I could play together."
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