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i foobar’d a fedora 4 machine a couple of days ago and when i went to  mount the disk into another machine i get this beautiful error:

mount: unknown filesystem type 'LVM2_member'

here was the syntax used:

termcb:~ # mount /dev/hda2 /mnt/old/
mount: unknown filesystem type 'LVM2_member'

and here was the drive :

termcb:~ # fdisk -l

Disk /dev/hda: 30.0 GB, 30005821440 bytes
255 heads, 63 sectors/track, 3648 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1          13      104391   83  Linux
/dev/hda2              14        3648    29198137+  8e  Linux LVM

so using lvm2 tools, we do a disk scan:

termcb:~ # lvmdiskscan
/dev/ram0  [       62.50 MB]
/dev/ram1  [       62.50 MB]
/dev/hda1  [      101.94 MB]
/dev/sda1  [       39.19 MB]
/dev/ram2  [       62.50 MB]
/dev/hda2  [       27.85 GB] LVM physical volume
/dev/sda2  [        2.01 GB]
/dev/ram3  [       62.50 MB]
/dev/sda3  [       60.00 GB]
/dev/ram4  [       62.50 MB]
/dev/sda4  [       86.96 GB]
/dev/ram5  [       62.50 MB]
/dev/ram6  [       62.50 MB]
/dev/ram7  [       62.50 MB]
/dev/ram8  [       62.50 MB]
/dev/ram9  [       62.50 MB]
/dev/ram10 [       62.50 MB]
/dev/ram11 [       62.50 MB]
/dev/ram12 [       62.50 MB]
/dev/ram13 [       62.50 MB]
/dev/ram14 [       62.50 MB]
/dev/ram15 [       62.50 MB]
0 disks
21 partitions
0 LVM physical volume whole disks
1 LVM physical volume

then we do a lvdisplay so we can get the LV Name and VG Name:

termcb:~ # lvdisplay
--- Logical volume ---
LV Name                /dev/VolGroup00/LogVol00
VG Name                VolGroup00
LV UUID                WBjpH6-Jezl-aI1z-XVSp-WzvW-qTDi-c1jkUv
LV Write Access        read/write
LV Status              NOT available
LV Size                26.06 GB
Current LE             834
Segments               1
Allocation             inherit
Read ahead sectors     0

--- Logical volume ---
LV Name                /dev/VolGroup00/LogVol01
VG Name                VolGroup00
LV UUID                Zykaw3-WBHU-oink-38W9-KylN-7u5j-PKx8qT
LV Write Access        read/write
LV Status              NOT available
LV Size                1.75 GB
Current LE             56
Segments               1
Allocation             inherit
Read ahead sectors     0

and also a vgdisplay to make sure it was the right drive:

termcb:~ # vgdisplay
--- Volume group ---
VG Name               VolGroup00
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  3
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               0
Max PV                0
Cur PV                1
Act PV                1
VG Size               27.84 GB
PE Size               32.00 MB
Total PE              891
Alloc PE / Size       890 / 27.81 GB
Free  PE / Size       1 / 32.00 MB
VG UUID               ryYRi4-mXOd-XFaW-4xnR-h1cl-hphh-5QQnlM

so at this point i re-tried to mount but using the VG Name:

termcb:~ # mount /dev/VolGroup00/LogVol00 /mnt/old/
mount: special device /dev/VolGroup00/LogVol00 does not exist

still failure

so i did an lvscan next to see what the status of the lv drive is:

termcb:~ # lvscan
inactive          '/dev/VolGroup00/LogVol00' [26.06 GB] inherit
inactive          '/dev/VolGroup00/LogVol01' [1.75 GB] inherit

fuck…. still inactive
thats when i stumbled across this post :
http://www.fedoraforum.org/forum/archiv … 64964.html

now the rest was pretty self explanatory:

modprobe dm-mod

vgchange -ay

termcb:~ # lvscan
ACTIVE            '/dev/VolGroup00/LogVol00' [26.06 GB] inherit
ACTIVE            '/dev/VolGroup00/LogVol01' [1.75 GB] inherit

mount /dev/VolGroup00/LogVol00 /mount/point

Success!!

this was done on a suse 10.1 box trying to mount a fedora 4 drive.

if this was gentoo it probably would have been much easier.

Source: http://pissedoffadmins.com/?p=481