The system is a virtual machine with default installation of Ubuntu Server. I have a bit of experience with Ubuntu Server, but not with LVM. Here's the situation:
What I would like to do, is split the above into one 80 GB EXT4 partition with the system, and one partition of about 40 GB which I can format with case-insensitive JFS. I have tried googling, but couldn't find anything which seemed applicable.
$ sudo pvscan
PV /dev/sda5 VG ubuntu1204lts-vg lvm2 [119.76 GiB / 0 free]
Total: 1 [119.76 GiB] / in use: 1 [119.76 GiB] / in no VG: 0 [0 ]
$ sudo pvdisplay
--- Physical volume ---
PV Name /dev/sda5
VG Name ubuntu1204lts-vg
PV Size 119.76 GiB / not usable 2.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 30658
Free PE 0
Allocated PE 30658
PV UUID fPv0q3-ARfR-sqQy-jrf9-8sj1-JdPL-enwbUa
Also, I should mention that I do not have physical access and can not boot off any removable medium.
I could repartition and reinstall the entire machine without LVM, but LVM seems a nifty concept - if only I could get the hang of it!