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Re: [dm-devel] Weird discrepancy between /dev/mapper/* and /dev/dm-* devices breaks lilo

On Wed, Jan 31, 2007 at 11:47:37AM +0100, Loïc Minier wrote:
>  When issuing the same dmsetup commands on two device nodes with the
>  same major/minor, the results are puzzling:

The device-mapper ioctls allow mapped devices to be referenced in three ways:

The uuid is optional.

dmsetup provides a command line wrapper around the ioctls.  It also
maintains the /dev/mapper directory, creating inodes there called 'name'.
It understands the above three ways of referencing devices: it does not
depend on the existing contents of '/dev'.

Some distributions chose to configure udev to create /dev/dm-N inodes where
N is the minor number.  (I have always discouraged that as a recipe for
confusion: I believe that using configurable names is a better approach.)

agk redhat com

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