EXT3: failed to claim external journal device.

[Andreas Dilger]

On Jan 24, 2006  19:12 -0600, Franco M. Bladilo wrote:
> We are having problems remounting an ext3 filesystem using an external 
> journal device. The filesystem in question was working fine until the 
> server was rebooted.
> This is what we see on dmesg when trying to mount:
> EXT3: failed to claim external journal device.
> The external journal lives on a LVM2 logical volume and it seems to be 
> accessible ( we can dumpe2fs and see filesystem information).
> 
> Here's the system information and command line used to create the 
> filesystem :
> SuSE SLES9 2 , kernel 2.6.5
> ada718-5:/ # rpm -qa | grep e2fs
> e2fsprogs-1.36-6.2
> -----------------------------------------
> mke2fs -O journal_dev   /dev/mapper/home_jou_vol_grp-home_jou 400000
> mke2fs -E stride=16 -O sparse_super,dir_index -j -J 
> device=/dev/mapper/home_jou_vol_grp-home_jou  /dev/mapper/home_vol_grp-home
> 
> Any ideas?

I believe the kernel does the journal device lookup by the device major/minor,
and those are not fixed for LVM devices.  Bull recently posted a patch here
for mount to automatically find the correct block device for this journal
UUID.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.