Mounting LVM root disk from rescue disk boot

[Paul Howarth]

Dave Atkinson wrote:
> Hi Fedora world,
> 
> Can anyone help with this?  I have tried a little googling, with no
> success...
> 
> Having just installed FC3 x86_64 on my new Athlon 64 box, I decided it
> would be nice to have i386 installed to deal with a few of the 'issues'
> I've encountered.  So I need to shrink the root partition, which I let
> the install routine create on an LVM partition spanning all available
> space on the hard disk (there is only one).  So, I know how to use LVM
> and e2fs tools to resize the partition, but I obviously need to have the
> partition unmounted.  Now, when the system is booted normally, it tells
> me that the root partition is /dev/mapper/VolGroup00-LogVol00.  If I
> boot the Rescue CD and skip mounting my root partition (in order to
> resize it) and I type
> 
> resize2fs /dev/mapper/VolGroup00-LogVol00 40000
> 
> I get something like "file not found" which I presume relates to the
> above device file, which indeed does not exist.  I tried 
> 
> resize2fs /dev/VolGroup00/LogVol00 and got a similar error.
> 
> Can anyone shed some light on this?  The only articles I've found on
> 't'net deal with volumes other than one's root partition...

Try running "vgcan -v --mknodes" and see if that helps.

Paul.