From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 03 Mar 2010 12:28:29 +0100
From: Milan Broz <mbroz@redhat.com>
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Subject: Re: [linux-lvm] System won't create devices from volume group :
 advice on dmsetup create command required (or alternative solution)
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To: junk4@klunky.co.uk, LVM general discussion and development <linux-lvm@redhat.com>

On 03/03/2010 11:43 AM, J4 wrote:
> # vgchange -a y mds
...
> # ls /dev/mapper | grep mds
> brw------- 1 root root 253, 11 Mar  3 11:17 /dev/mapper/mds-mds

So the only LV name "mds" there is properly activated.

LVM will not activate partitions on the LV automatically,
but you can use "kpartx" utility to do that (see man kpartx).

Try "kpartx -a /dev/mds/mds"

(before deactivating LV you will need run kpartx -d to remove these
partition mappings again.)

Milan