ufsrestore and Exayte 220

I have a set of tapes that contain a full system backup done with 'ufsdump' on an Exabyte 220. I don't know how many tapes the backup spans, but I'd guess at least 3-4 tapes (the set is 20, but some of that is subsequent incremental backups). I used 'ufsrestore ilv' and was able to traverse at least some of the directory system on the tape, but not all of it. In particular I can 'cd' into '/home/project' but there is nothing in there. There should be several hundred megabytes of data. What is seems like is that the only part of the directory structure that shows up is that part of the backup that is on the first tape, but if I try to use the 'ufsrestore' command on any other tape I get an error about it not being volume 1.

So what's the deal here? Is it not possible to use the interactive mode if the backup spans multiple tapes or am I just doing something wrong? Is my only solution to extract the entire backup to disk?