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I was only using a part of my external usb hard drive to keep backups and needed to extend the partition to accomodate the ever-growing backup files.

There are quite some ways to do this which can be referenced at FedoraNews.org and TLDP.org .

Below is a quick command line reference if you are familiar with the process already.

1. I added an additional 10GB of space:
   

   # lvextend -L+10G /dev/vg00/lvol0
   

2. Unmount the drive:

   # umount /mnt/usbdisk
   

3. Check the logical volume:

   # e2fsck -f /dev/vg00/lvol0
   

4. Increase the file system size to match.

   # resize2fs -pf /dev/vg00/lvol0
   

5. Remount:

   # mount /mnt/usbdisk
   

Here's what the logical volume is currently displayed as after extending from 50GB to 60GB:

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg00/lvol0
  VG Name                vg00
  LV UUID                vVr2IO-81Cc-zv05-6Ffu-hHUD-8xpc-9qUBDh
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                60.00 GB
  Current LE             15360
  Segments               1
  Allocation             next free (default)
  Read ahead sectors     0
  Block device           253:0