mount lvm partition

ufmale · 04-02-2009, 01:52 PM

I am trying to mount a drive that has Redhat installed.
Booting machine from that drive is not working. It reports
that it cannot find the OS. I think the drive is fulled.
I am trying to mount the drive and trying to delete couple of files to see if it can fix the problem.

However, mount does not work on the /dev/sdq2 partition.
It need a partition type, which i have no clue what it is.
mounting without option does not work either.
Can someone help?

Disk /dev/sdq: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdq1 * 1 13 104391 83 Linux
/dev/sdq2 14 14593 117113850 8e Linux LVM

[root@mnt]# mount -t LVM /dev/sdq2 /mnt/linux/
mount: fs type LVM not supported by kernel

acid_kewpie · 04-02-2009, 02:08 PM

LVM isn't a filesystem type, only a partition type. If you have LVM supported on whatever OS you're actually running under (which I assume is not Redhat...) then lvdisplay will show all recognised logical volumes, and it's the /dev/ entry there you'll want to mount, e.g. /dev/VolGroup/LogVol00

ufmale · 04-02-2009, 02:45 PM

I connected the drive to other system via a usb enclosure.
The lvdisplay does not show the volume on that drive. It only shows those on the local machine.
Please suggest.

acid_kewpie · 04-02-2009, 04:25 PM

run lvscan to scan all disks for LVM instances.

ufmale · 04-02-2009, 05:57 PM

Here is what i got. It looks like the lvcan see only the sda drive.
The one I need is the sdb. Using lvmdiskcan see all of them, but does not tell me how to mount the drive.

Quote:

[root@mm ~]# /usr/sbin/lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [7.34 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [512.00 MB] inherit
[root@mm ~]# /usr/sbin/lvmdiskscan
/dev/ramdisk [ 16.00 MB]
/dev/root [ 7.34 GB]
/dev/ram [ 16.00 MB]
/dev/sda1 [ 101.94 MB]
/dev/VolGroup00/LogVol01 [ 512.00 MB]
/dev/ram2 [ 16.00 MB]
/dev/sda2 [ 7.90 GB] LVM physical volume
/dev/ram3 [ 16.00 MB]
/dev/ram4 [ 16.00 MB]
/dev/ram5 [ 16.00 MB]
/dev/ram6 [ 16.00 MB]
/dev/ram7 [ 16.00 MB]
/dev/ram8 [ 16.00 MB]
/dev/ram9 [ 16.00 MB]
/dev/ram10 [ 16.00 MB]
/dev/ram11 [ 16.00 MB]
/dev/ram12 [ 16.00 MB]
/dev/ram13 [ 16.00 MB]
/dev/ram14 [ 16.00 MB]
/dev/ram15 [ 16.00 MB]
/dev/sdb1 [ 101.94 MB]
/dev/sdb2 [ 111.69 GB] LVM physical volume
3 disks
17 partitions
0 LVM physical volume whole disks
2 LVM physical volumes

I then try to mount the one shown in lvscan. Mounting LogVol00 works fine. It is the sda drive.
but LogVol01 does not work

Quote:

[root@mm ~]# mount /dev/VolGroup00/LogVol01 /mnt/lv1
/dev/VolGroup00/LogVol01 looks like swapspace - not mounted
mount: you must specify the filesystem type

Now. Trying the vgcan and found two VolGroup00. I think the 2nd one is the one
from sdb disk. How do I activate that 2nd group then?

Quote:

[root@mm ~]# /usr/sbin/vgscan
Reading all physical volumes. This may take a while...
Found volume group "VolGroup00" using metadata type lvm2
Found volume group "VolGroup00" using metadata type lvm2

acid_kewpie · 04-03-2009, 12:43 PM

I believe you'd need to rename it to somethign else, you can't have two LVM's with the same name.

ufmale · 04-06-2009, 08:36 PM

Found the way to do it.

First trying to rename it directly. Ofcourse.. it does not work.
Fortunately, my system shows a warning of duplicate Volgroup with UUID (i think that what it is called) of the 2nd system.

So I use

Quote:

$ vgrename GhQnCM-fg992-xxxx-xxxx-xxx-xxxx-xxxxx VolGroup01.

Then call $ vgscan.

Now my 2nd disk or the VolGroup01 shows up with "inactive" status. Then I activate it with

Quote:

$ vgchange -ay VolGroup01
2 logical volume(s) in volume group "VolGroup01" now active

Now.. I just mount it with regular mount cmd.