mount: unknown filesystem type LVM2_member

Please find below :- 

root@zoo:~# mount /dev/sdd2 /home/mukesh
mount: unknown filesystem type 'LVM2_member'

root@zoo:~# 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 its lvm or not, using lvmdiskscan (/dev/sdd2 here)

root@zoo:~# 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

Scan LVM

root@zoo:~# lvscan
 inactive '/dev/VolGroup00/LogVol00' [457.75 GiB] inherit
 inactive '/dev/VolGroup00/LogVol01' [1.94 GiB] inherit

Run below command for Activate LVM

root@zoo:~# vgchange -ay

Check Now

root@zoo:~# lvscan
  ACTIVE            '/dev/VolGroup00/LogVol00' [457.75 GiB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [1.94 GiB] inherit

Now mount :

mount /dev/VolGroup00/LogVol00 /home/mukesh

Done !