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Date: Wed, 10 Nov 2010 12:56:24 -0500
From: Mauricio Tavares <raubvogel@gmail.com>
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Subject: Re: [linux-lvm] Bad disk?
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To: Phillip Susi <psusi@cfl.rr.com>, LVM general discussion and development <linux-lvm@redhat.com>

On 11/10/2010 10:11 AM, Phillip Susi wrote:
> On 11/10/2010 9:39 AM, Mauricio Tavares wrote:
>> Yesterday I added a hard drive (to put extra stuff on it) to my ubuntu
>> 10.10 box and created a LVM in it. Then copied some files to it and
>> restarted the machine to see if it would mount into the right
>> mountpoint. It didn't. So I decided to see if it was there (vg in
>> question is export):
>
> None of the errors you posted mention a physical disk at all, so there
> isn't anything wrong with them.  To find out what dm-0 is you need to
> poke around with dmsetup.

	Now that might be interesting since I honestly do not know how to use 
it (and my google-fu seems weak today). But this is a bit more info I found:

raub@strangepork:~$ sudo pvs -a
   /dev/dm-0: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-0: read failed after 0 of 4096 at 429496664064: Input/output 
error
   /dev/dm-0: read failed after 0 of 4096 at 429496721408: Input/output 
error
   /dev/dm-0: read failed after 0 of 4096 at 0: Input/output error
   /dev/dm-0: read failed after 0 of 4096 at 4096: Input/output error
   /dev/dm-0: read failed after 0 of 4096 at 0: Input/output error
   PV         VG     Fmt  Attr PSize   PFree
   /dev/dm-0              --        0       0
   /dev/dm-1  root   lvm2 a-   277.05g 192.55g
   /dev/dm-2              --        0       0
   /dev/dm-3              --        0       0
   /dev/dm-4              --        0       0
   /dev/dm-5              --        0       0
   /dev/ram0              --        0       0
   /dev/ram1              --        0       0
   /dev/ram10             --        0       0
   /dev/ram11             --        0       0
   /dev/ram12             --        0       0
   /dev/ram13             --        0       0
   /dev/ram14             --        0       0
   /dev/ram15             --        0       0
   /dev/ram2              --        0       0
   /dev/ram3              --        0       0
   /dev/ram4              --        0       0
   /dev/ram5              --        0       0
   /dev/ram6              --        0       0
   /dev/ram7              --        0       0
   /dev/ram8              --        0       0
   /dev/ram9              --        0       0
   /dev/root              --        0       0
   /dev/sda1              --        0       0
   /dev/sda3              --        0       0
   /dev/sdc1  export lvm2 a-   465.76g  65.76g
raub@strangepork:~$

FYI, the root vg in inside /dev/sda3, which is an encrypted partition. 
How can I find which drive /dev/dm-0 is?