Ive been tearing my hair out for about a week now trying to figure out how to do this.

I have two HDD's in my server, both 250gig. They both have ubuntu installed, one is currently booted. I want to mount the second (old) drive to /mnt/external

If I mount through /dev/disk/by-uuid It just mounts the boot partition, and not my actual data.

I also tried vgs-v to determine, but the names are the same, and don't know where to go from here.

root@onlinelabtests:~# vgs -v

Finding all volume groups

Finding volume group "SysVolGroup"

Archiving volume group "SysVolGroup" metadata (seqno 3).

Archiving volume group "SysVolGroup" metadata (seqno 3).

Creating volume group backup "/etc/lvm/backup/SysVolGroup" (seqno 3).

Finding volume group "SysVolGroup"

Archiving volume group "SysVolGroup" metadata (seqno 3).

Archiving volume group "SysVolGroup" metadata (seqno 3).`

Creating volume group backup "/etc/lvm/backup/SysVolGroup" (seqno 3).

VG          Attr   Ext   #PV #LV #SN VSize   VFree VG UUID      

SysVolGroup wz--n- 4.00m   1   2   0 233.72g    0  812dMv-qSf3-xnpP-khlB-mkIf-q64l-Z2Rawf     

SysVolGroup wz--n- 4.00m   1   2   0 233.72g    0  Z3IbWM-FEvq-n6fs-lhm9-5uQq-mdxj-QNfDLJ

and this

root@onlinelabtests:~# vgchange -a y

2 logical volume(s) in volume group "SysVolGroup" now active

2 logical volume(s) in volume group "SysVolGroup" now active

But /dev/disk/by-uuid still doesnt show anything else.

Any help appreciated.