My problem is that Compression does not work. I can select it in on the media, select it on the drive, select it on the job, and yet I will only ever see a maximum of 20gb of data backed up on a 20/40Gb tape. There is never 21 or 22gb of data backed up, it is always less than 20gb. This to me spells out the fact that compression is not working, and not that it is just less than the theoretical maximum of 40gb, I never expect to get 40gb, I usually would expect 25-35gb, depending on the job, and what type of files it is backing up. So, I have ruled out just a bad HW/SW compression ratio, as it never gets beyond 20Gb.
I have upgraded the Veritas Software, I have upgraded the drivers, and have double and triple checked all the settings suggested in the following threads and support docs, and tested Hardware Compression, Software Compression, and also Hardware/Software Compression option incase one is not available. They all give the same result of less than the native capacity of the tape.
http://seer.support.veritas.com/docs/199542.htm
http://forums.veritas.com/discussions/thread.jspa?forumID=103&threadID=46459&messageID=4364148&
http://forums.veritas.com/discussions/thread.jspa?forumID=103&threadID=48521&messageID=4370561&
http://forums.veritas.com/discussions/thread.jspa?forumID=103&threadID=48550&messageID=4370813&
http://forums.veritas.com/discussions/thread.jspa?forumID=103&threadID=55661&messageID=4401632&
This next thread had some actual useful information about stopping Backup Exec Services and checking the tape capacity:
http://forums.veritas.com/discussions/thread.jspa?forumID=103&threadID=46505&messageID=4360998謦
So, after having tried all this, is there anything else I can do?