[CentOS] figuring out LogVol details for mount

Fri Apr 1 03:36:27 UTC 2011
neubyr <neubyr at gmail.com>

On Thu, Mar 31, 2011 at 8:39 PM, Nico Kadel-Garcia <nkadel at gmail.com> wrote:
> On Thu, Mar 31, 2011 at 8:50 PM, Winter <winter at frostmarch.com> wrote:
>> On 3/31/2011 6:22 PM, neubyr wrote:
>>> Hi,
>>> I need to mount a LVM in rescue mode to create a new initrd image. I
>>> am not sure how do I fond out which LogVol is to be mounted. How do I
>>> find it out?  In most of the configs I have used LogVol00 with ext3
>>> filesystem which contains OS install. This particular system is not
>>> installed by me and I am not sure how do I find it out. I did try 'lvm
>>> lvs' command, but probably that's not the right command here. Any
>>> help?
>>> --
>>> thanks,
>>> neuby.r.
>> Good evening, Neuby
>> When you boot into rescue mode are you given the option to
>> continue-mount or read-only-mount the system to /mnt/sysimage?  You
>> could try to view /mnt/sysimage/etc/fstab to find the partition types.
>> Regards,
>> W.
> If he could do *that*, he would already have the volumes mounted,
> barring other strangeness going on. They'd all be mounted under
> "/mnt/sysimage", and would be revealed by the "df" or "mount"
> commands.
> If this isn't available, the "pvscan", "vgscan", and "lvscan" commands
> are all available in the bootable CD, *but* they are all built into
> the underlying "lvm" command. So type "lvm pvscan" to find what
> physical volumes are set up for LVM, "lvm vgscan" to find the volume
> groups, and "lvm lvscan" to find the volumes.
> Re-activating an 'inactive' LVM due to a messed up configuration or
> volume is left as an exercise for the reader.
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It's not mounting any volumes by default as it's not able to read
partition table and hence says no Linux partitions found. But I am
able to see partitions using fdisk and check LVM volumes. I am not
sure which volume of that contains OS install  VolGroup00-LogVol00 or
VolGroup00-LogVol01. Is there any way I can determine it?