Mount your hard drive error mount you must specify the filesystem type LVM?

Troubleshoot problems with Mount LVM hard drive under Linux

My machine two hard drives, one 80g of the LVM I took from another machine, with data on it. I want to mount it on my current system, but no, high man to point!!!!!!
[Root@all/]# Fdisk-l
disk/dev/hdc:80.0 GB, 80026361856 bytes
255 heads, Sectors/track, 9729 cylinders
Units = Cylinders of 16065 * 8225280 bytes

Device Boot Start End Blocks Id System
/DEV/HDC1 * 1 104391 Linux
/DEV/HDC2 9729 78043770 8e Linux LVM

disk/dev/hda:40.0 GB, 40020664320 bytes
255 heads, Sectors/track, 4865 cylinders
Units = Cylinders of 16065 * 8225280 bytes

Device Boot Start End Blocks Id System
/DEV/HDA1 * 1 255 2048256 Linux
/DEV/HDA2 256 3934 29551567+ Linux
/dev/hda3 3935 4444 4096575 Linux
/DEV/HDA4 4445 4865 3381682+ f Win95 Ext ' d (LBA)
/dev/hda5 4445 4699 2048256 Linux
/dev/hda6 4700 4801 819283+ Linux
/DEV/HDA7 4802 4865 514048+ Linux Swap
[Root@all/]# Mount/dev/hdc2/mnt/cdrom
Mount:you must specify the filesystem type
Mount when the error above the line! who gives a hint! Thank you!

Reply:

1. Use Vgscan First
2.vgchange-ay
3.lvscan
4.mount

By the third step, if the normal will show two hard drive of the LV state is active, at this time again

#mount-T Ext3/dev/vgname/lvname/mnt/cdrom

will be successful.