[CentOS] Device Mapper and pretty names

Filipe Brandenburger filbranden at gmail.com
Tue Jun 10 02:04:35 UTC 2008

On Mon, Jun 9, 2008 at 8:31 PM, Joseph L. Casale
<JCasale at activenetwerx.com> wrote:
> How does one view the dm-{n} names wrt the actual dev names?
> I assume it involves dmsetup but I cant figure it out. I am using iostat
> to track some busy disk io and don't know which dm-{n} to watch :)

Try ls -l /dev/mapper/

The minor number will correspond to the {n} in dm-{n}.

For instance, this:

$ ls -l /dev/mapper/
brw-rw----  1 root disk 253,  1 Apr 30 15:32 sysvg-home

indicates that dm-1 is /dev/sysvg/home


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