Bug#705879: moreinfo

[Dmitry Smirnov <onlyjob@member.fsf.org>]

I didn't try to reproduce this but most likely it has nothing to do
with boot partition. I had similar problem with mounting any
ext4/external_journal partition after reboot because sd[a-z] mappings are not
persistent. Therefore there is no guarantee that "sda" will be associated with
the same device on next reboot. For example if you have two hard disks A known
as "sda" and B known as "sdb" then after reboot you may have disk B mapped to
"sda" and A bound to "sdb".

Also this problem is probably not specific to Debian in any way.

It may help if you try to create external journal using /dev/by-id or
/dev/by-path (I didn't verify if it work) or use another workaround mentioned
in

  http://raid6.com.au/posts/fs_ext4_external_journal_caveats/

Regards,
 Dmitry Smirnov
 GPG key : 4096R/53968D1B