You might also consider a tool I've used before from Storix (www.storix.com) It would let you run a backup and the rebuild your server laying out new partitions as you go. Probably better than just...
Although this will allow you have more space for your current problem it is not going to clean out stuff on your root filesystem leading to the same space problem down the road in other places as log...
You cannot increase the size of a HTFS partition without doing a backup and restore.
Do you have data files in the root file system, or do the log files just need to be truncated.
The easiest...