Setting filetape sizes

I am using filetapes for backups. I have a 120GB Raid array that I back up to another 120GB single drive. Unfortunately, I've started getting an error during the nightly backup:

taper: tape daily20 KB 4194272 fm 8 writing file: No space left on device
taper: retrying devserv:/common.2 on new tape: [writing file: No space left on device]
taper: tape daily21 KB 0 fm 0 [OK]

I assume this is because the new files on this "disk" are larger than the filetape volume. I figured 4GB would be plenty for a file volume, but someone added a new directory with 9 GB of data. Oops.

What is a good size to use for filetape volumes? Can I change these sizes after I've started using them? What would be the best way to get out of the situation I'm in?

Thanks for any help you can give me.

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