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Date: Mon, 17 Aug 2009 11:01:12 +0200
From: Peter Rajnoha <prajnoha@redhat.com>
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Subject: Re: [linux-lvm] /dev/dm-* or /dev/mapper/*
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On 08/17/2009 02:08 AM, Edward Siefker wrote:
> I originally set up raid-luks-lvm on this machine with debian's
> installer tool, now I am trying to add another encrypted raid1 device to
> the existing volume group.  I already have the raid device set up and
> encrypted, that's no problem.  Now the linux gazette
> (http://linuxgazette.net/140/pfeiffer.html) tells me I should run
> 'pvcreate' on the device in /dev/mapper.  However, if I examine my
> existing physical volumes with 'pvscan' I get the following:
> 
> iblis:/home/hatta# pvscan
>   PV /dev/dm-0   VG iblis-volumes   lvm2 [931.32 GB / 0    free]
>   Total: 1 [931.32 GB] / in use: 1 [931.32 GB] / in no VG: 0 [0   ]

..also, try to look at devices/preferred_names setting in lvm.conf.
This one should give priority to scanned devices and prioritize them..

Peter