Mount: unknown file system type LVM2_member

Dezembro 31st, 2018

Mount: unknown file system type LVM2_member

So I’m planning on making a series, “mount: unknown file system type $TYPE”. I already have how to mount a ntfs partition, also how to mount a nfs on proxmox, now to be continued by another fun file system. I was going through old disks, so I came across one that had LVM2_member.

root@evoluso:~# mount /dev/sdd2 /mnt/disk
mount: unknown filesystem type 'LVM2_member'

The fdisk -l already told me it is a LVM :

root@evoluso:~# fdisk -l /dev/sdd
Disk /dev/sdd: 233.8 GiB, 251000193024 bytes, 490234752 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0009345d
Device Boot Start End Sectors Size Id Type
/dev/sdd1 * 63 208844 208782 102M 83 Linux
/dev/sdd2 208845 488247479 488038635 232.7G 8e Linux LVM

(/dev/sdi1 is /boot partition, /dev/sdi2 is where the /home data resides). Seems lvm2 tools also provide a way to check if it is lvm or not, using lvmdiskscan (/dev/sdd2 here)

root@evoluso:~# lvmdiskscan
/dev/sdb1 [ 1.82 TiB]
/dev/sdc2 [ 149.04 GiB]
/dev/sdd1 [ 101.94 MiB]
/dev/sdd2 [ 232.71 GiB] LVM physical volume
0 disks
4 partitions
0 LVM physical volume whole disks
1 LVM physical volume

Fine, now let’s scan what lv’s are to be found using lvscan

Since this is an old disk in an enclosure, it is not activated on system boot. So we need to “activate” this lvm volume.

root@evoluso:~# vgchange -ay
2 logical volume(s) in volume group "VolGroup00" now active

Ready to mount:

root@evoluso:~# lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [230.75 GiB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [1.94 GiB] inherit

Now to mount:

mount /dev/VolGroup00/LogVol00 /mnt/disk