Lustre devel - Dec 2006 - [Bug 11484] '/usr/sbin/lctl (22): error: setup: Invalid argument' with external journal on MD

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(In reply to comment #1)
> The blkid -l change is from bug 10832, according to the ChangeLog.  Reading
> through the blkid and libblkid code it appeared that this was the correct
> solution at the time, and it did resolve the problem for mjmac.
I see that in the bug.  I was going based on the documented behaviour of -l.  
> What version of e2fsprogs are you using?
e2fsprogs-1.38.cfs2-1

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(In reply to comment #1)
> The other problem here appears to be that the "journal_device="
mount option is
> not working.  In this case that is a good thing because we
shouldn''t be using
> the raw partition for the journal instead of the MD device.      
Likely instead that the kernel is refusing to use an in-use device for an
external journal.  Similar things happen on mount as well:

# mdadm --create /dev/md8 --run --chunk=$CHUNK --level=5 --raid-devices=5
/dev/sdam /dev/sde /dev/sdx /dev/sdar /dev/sdaf
mdadm: array /dev/md8 started.
# mount -t ext3 /dev/sdaf /mnt/tmp
mount: /dev/sdaf already mounted or /mnt/tmp busy