as Greg correctly points out the search indexing part of livelink has tremendously improved so you are most likely to see an extremely compact index folder once you upgrade to the current version.No livelink upgrade is a cake walk,you may need additional hardware to accomodate the new search paradigm(metadata in RAM),test any customizations,changes to schema etc etc.Also in your case you may have to go thru a series of supported upgardes,maybe from 9.1 to 9.5 SP1 to 9.7 SP1 (I am making this up you have to check the supported way of doing this).
Please visit the upgrades section of the livelink ECM KB.
Well, if I called the wrong number, why did you answer the phone?
James Thurber, New Yorker cartoon caption, June 5, 1937