I have a similar configuration, but have a 16 slot SLDT Quantum. Backup exec 8.6 really fazed me until I ran the Media Rotation Wizard. I have 7 server to backup every night including SQL, Oracle & Exchange and could not get a backup to work properly. After much reading and help from the wizard, this is what I found.
Use the Wizard to create 2 Media sets - Rotation : Full & Rotation: Differential. The wizard pretty well does everything for you though.
You don't need to partition any slots in your library really, its the media sets that are important, and things are easier if you have a barcode reader and use barcodes on your tapes. If not, then label the tapes manually, and then change the Media Label for that tape to match the manual label.
You have to deciede how many tapes you will dedicate for each task, Differential might take 4 tapes, and you will leave them in the library. These 4 tapes will cover the differential data from Monday to Thursday. Depending how much differential data you have, the set might be good for a few weeks. By 'Good' I mean that you can have several weeks data online, you never remove these tapes from the library.
The Full backups will consume at least 5 tapes, depending on how you interpret end-of-month and end-of-week. Label these Week 1 through Week 5 on the tape and the same on in BENT.
If you have inserted all your tapes in the library, you call see them under the Media tab in the ALL Media subgroup. Here you right click and change the label to the ones for Differential and Full. Then Move them into the BENT created Media Sets, Rotation - Full & Rotation - Differential.
When you initially create a rotation, BENT asks about overright protection for the rotation sets. Depending on how much Differential data you want to keep online, set the overwrite protection to 7 days and the append to 3 or 4 days. Set the Full tapes to 1 month for both, so that just in case you forget to remove a weekly tape, it won't get overwritten until the next time it is supposed to get overwritten (which would be in a month).
You can also create a monthly backup manually by creating a scheduled task reusing the Full Backup set that was created by BENT. Under the Advanced button, you can set it to run only on the last day of every month. The only problem with this is that you now have to go back to the weekly rotation job and using the Advanced buttin, de-select any friday that would be the end of the month also. i did 2 years of checking in about 5 minutes for this. I also created another Media set called Monthly - Full, and assigned several tapes to this set.
The thing that I have found that is important about this setup is that the location of the tapes is not important at all, just that the tape with the label that belongs to the Media set is somewhere in the library.
If you are still confused, I can try to be more specific on particular issues.
Robert Crooks c.Tech
Ivaco Rolling Mills