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https://bugzilla.lustre.org/show_bug.cgi?id=11484



(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

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