Step 1. Use a live boot cd. I used Knoppix.
Step 2. Don’t mount the filesytem
Step 3. On the CLI type: lvm
Step 4. Once in LVM tpe the following:

vgscan # This will show you the name of the Volume Group
vgchange –available y VolGroup00 # Activates the Volume Group and the Logical Volumes in it
lvscan # Shows the Logical Volumes as active; the devices in /dev it mentions should now exist
exit # Exits you to the prompt

Step 5. Resize the filesystem with command:

e2fsck -f /dev/VolGoup00/LogVol00 # fsck on the filesystem
resize2fs /dev/VolGoup00/LogVol00 xxG # resize the file systems to xx GB; xx should be less than the current fs size
e2fsck -f /dev/VolGoup00/LogVol00 # Do another fsck on the filesystem; fix any errors which appear

Step 6. Run lvm again and type:

lvreduce -L xxG /dev/VolGoup00/LogVol00 # Resize the LV to xx GB; xx should be the same as above
exit # Quit, return to the prompt

Step 7. Do another filesystem check:

e2fsck -f /dev/VolGoup00/LogVol00 # Do another fsck on the filesystem; fix any errors which appear


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Step 8. Remove the CD and reboot.