Re: mdadm raid can't set proper devices in super-block

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On 12/03/2012 17:38, Carl Engstrom wrote:
resetting mdadm superblock

--------------------------------------------------------------------------------

Hey folks,

I'm having some issues with my md array after upgrading to 11.04.
[...]
Number Major Minor RaidDevice State
  this 1 8 17 1 active sync /dev/sdb1

0 0 8 1 0 active sync /dev/sda1
  1 1 8 17 1 active sync /dev/sdb1
  --------

the array will start with:
  mdadm -A --update=super-minor /dev/md0 /dev/sdb1 /dev/sdc1

So it starts just fine if you specify the devices...

Anyone know what's going on?

--update=super-minor is working fine; both devices have a preferred minor device number of zero, as they should for the array to be /dev/md0.

What happens if you
  mdadm --stop /dev/md0
  mdadm --assemble --scan --verbose /dev/md0
?

Where do you want to mount /dev/md0?

What messages do you get during boot-up (dmesg) about why md0 isn't being assembled?

What's in your /etc/mdadm.conf?

If /etc/mdadm.conf says sda1 and sdb1, fix it and do whatever you need to do on Ubuntu to rebuild your initrd/initramfs (so that your edited mdadm.conf goes into it), then reboot.

Hope something somewhere in amongst this lot helps...

Cheers,

John.

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