[linux-lvm] Bad disk?

[Ray Morris]

On 11/10/2010 11:56:24 AM, Mauricio Tavares wrote:

> How can I find which drive /dev/dm-0 is?

Try:
  cat /sys/block/dm-0/dm/name

On my system, I created dm2device so I can tell which snapshot is
full or whatever device has a problem:

# cat /usr/local/bin/dm2device
#!/bin/sh

cat /sys/block/$1/dm/name

--
Ray Morris
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On 11/10/2010 11:56:24 AM, Mauricio Tavares wrote:
> 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 at 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 at strangepork:~$
> 
> FYI, the root vg in inside /dev/sda3, which is an encrypted  
> partition. How can I find which drive /dev/dm-0 is?
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>