CentOS - Feb 2006 - Mount LVM

Hi guys,
sorry if this is trivial, but I have been googling a couple days and 
already compromised a test disk trying to figure this out, so I thought 
it is time to ask for some advice. I have a disk that comes from a clean 
and working CentOS4.2 install, and I am trying to use an external usb to 
ide converter to mount it on another workstation with CentOS4.2. I am 
trying this to better understand how LVM works, in the case of a future 
disaster/recovery scenario.
Simply trying to mount it:
mount -t ext3 /dev/sdc2 /share/
mount: wrong fs type, bad option, bad superblock on /dev/sdc2, or too 
many mounted file systems

fdisk -l shows
/dev/sdc1   *           1          13      104391   83  Linux
/dev/sdc2              14        7476    59946547+  8e  Linux LVM
and in fact, /dev/sdc1 is automatically mounted.

vgscan reveals only my current volume group
Found volume group "VolGroup00" using metadata type lvm2    (mount
-->
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw))

lvmdiskscan  -->  /dev/sdc2    [       57.17 GB] LVM physical volume  
---> This being the volume I want to mount

lvscan detects only the volumes on my system 
ACTIVE            '/dev/VolGroup00/LogVol00' [112.34 GB] inherit 
ACTIVE (root)           '/dev/VolGroup00/LogVol01' [1.94 GB] inherit 
(swap)

If I  run "vgchange -a y" -->  2 logical volume(s) in volume group 
"VolGroup00" now active, the ones in my system.

I went through LVM Howto, and also tried to follow a few "mount/recovery 
procedures" with the only result of compromising the other test disk.
I think this the problem is that the vg on my system has the same name 
of the one on the external usb disk, but I am not sure of what result 
would have running vgrename, vgcreate or lvcreate on the data, so I'd 
rather wait for some advice.

Any help appreciated

Quoting Simone <simone72 at email.it>:
> I think this the problem is that the vg on my system has the same 
> name of the one on the external usb disk, but I am not sure of what 
> result would have running vgrename, vgcreate or lvcreate on the data, 
> so I'd rather wait for some advice.
This would indeed be a problem.  You might try disconnecting your 
internal drive, booting off rescue CD and renaming the volume group on 
external drive.  Alternative to that would be to wipe out the external 
drive (if you don't have any data on it) and recreate it from scratch.

BTW, you can't mount partition that is marked as physical volume 
directly.  You need to access logical volumes on it through LVM devices 
(usually /dev/vg-name/lv-name).

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