here is a simple example:

dump 5usdf 60000 6250 /dev/rst0 /work


What they mean are as follows:

5u : Level 5 backup
*s : size which is 60000 or 60 Kilo feet tape length
*d : desity 6250bpi
f : tape device /dev/rst0

and then the file system.
* are optional fields. I know that dump in solaris would prompt you for the tapes until it gets done with the dump.

dump 0uf tape_path file


Hopw this would help you.
Sam