Procedure for resizing of LVM Volume Groups
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If there isn't enough space on a given VM for either actual storage space or for LVM snapshots:

1) Add new physical (or virtual) disks to the VM (Nick, Jamin, Chris B.)

2) Rescan the SCSI bus to inform the kernel of the new device

    # echo "- - -" > /sys/class/scsi_host/host#/scan
    (Where # is the host scsi adapter [0,1,2,...]. Rescan all if need be)

3) For understanding LUN to kernel device name mapping, install lsscsi
    
    # apt-get install lsscsi
    
    # lsscsi
    [1:0:0:0]    cd/dvd  NECVMWar VMware IDE CDR10 1.00  /dev/sr0
    [2:0:0:0]    disk    VMware   Virtual disk     1.0   /dev/sda
    [2:0:1:0]    disk    VMware   Virtual disk     1.0   /dev/sdb
    [2:0:2:0]    disk    VMware   Virtual disk     1.0   /dev/sdc
    
The newly added disk will likely be at /dev/sdb or /dev/sdc

4) Create LVM partitions with the new disk (optional, can use whole disk too)

    # fdisk /dev/sdb
    
    In fdisk, choose:
        n (new partition)
        p (primary)
        1 (choose partition size by sectors)
        t (set the partition type)
        8e (Linux LVM)
        w (write the partition table)

5) pvcreate /dev/sdb (or /dev/sdb1 if you created a partition)

6) vgextend ubuntu /dev/sdb (Note that the VG on cn-stage-unm-1 is 'ubuntu'. Others vary)