[ale] Kubuntu 13.04 danger: beware /dev/dm-*

[glallen01 at gmail.com (George Allen)]

Good to know, thanks! Will probably look at this again when I get off
the laptop and back to a multi-disk setup.

> On another reboot the dm-* device linked on right side in /dev/mpath might
> have changed but the left side of the link won?t and whatever the dm-* is
> WILL still be the WWID (UUID) you had defined in multipath.conf.   Note the
> /dev/dm* device whatever it is will have the same major/minor as see in the
> /dev/mapper device which is one way to confirm it is what you think it is.
> This means you can use either the /dev/mpath/* or the /dev/mapper/* device.
>

So - either way, you still never want to refer directly to /dev/dm? in
a config, since they'll re-number. But you can assure that all the
other dynamic names are stabilized to your tastes... I think I saw a
bug in launchpad for a previous ubuntu version for this. Going to look
again and see if I can either find, or file one.