what is this thing /dev/dm-[0-6] ? :scratch:

marozsas · 07-13-2007, 08:25 AM

Hi fellows,

In my new Fedora 7 I notice there are a few new things.
For instance, theses /dev/dm-[0-6] devices that are showed in a "fdisk -l" command.

What is it ?
What is its purpose ?

I don't have a crypt device or a RAID system. As far as I know, the device mapper is used to map a crypt-loop device or a raid system, but it is not the case.

nx5000 · 07-13-2007, 09:06 AM

You don't have lvm? Lvm is based on device mapper.
As you said, its also used for loop disks: my /krypt is the mount point for /dev/dm0, dm0 being a map on /dev/hda6

try
dmsetup ls
gives me this:
_dev_hda6 (254, 0)

marozsas · 07-13-2007, 09:23 AM

Hi nx5000 !

Yes, I forgot I have a LVM in place. It is just one disk, one LVM partition, which is the default in Fedora7, so I forgot about it.
And thanks for the (new for me) command, dmsetup.

cheers,

nx5000 · 07-13-2007, 09:24 AM

No problem!
Cheers!