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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.

[email protected]:~# mount /dev/sdd2 /mnt/disk
mount: unknown filesystem type 'LVM2_member'
The fdisk -l already told me it is a LVM :
[email protected]:~# 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)

[email protected]:~# 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
[email protected]:~# lvscan
inactive '/dev/VolGroup00/LogVol00' [230.75 GiB] inherit
inactive '/dev/VolGroup00/LogVol01' [1.94 GiB] inherit
Since this is an old disk in an enclosure, it is not activated on system boot. So we need to “activate” this lvm volume.
[email protected]:~# vgchange -ay
2 logical volume(s) in volume group "VolGroup00" now active
Ready to mount:
[email protected]:~# 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