From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed, 15 Jan 2014 15:49:11 +0000
From: Alasdair G Kergon <agk@redhat.com>
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Subject: Re: [linux-lvm] Identifying useable block devices
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To: Marius Vollmer <marius.vollmer@redhat.com>
Cc: linux-lvm@redhat.com

On Wed, Jan 15, 2014 at 10:19:33AM +0200, Marius Vollmer wrote:
> How can a program tell that only /dev/mapper/TEST-thin can really be
> used as a block device, and the rest should be ignored?
 
/dev/mapper is meant only for internal use.

Use /dev/$vg/$lv instead (in the case of LVM).
Internal LVs shouldn't appear there.

Alasdair