> The 8000E-S is an external SCSI device, will do 4Gb native,

I have one of these; it works quite well.

> Now, what I'm not sure of, and the thing that puts me off, is how
> you'd get such a device to work under NetBSD.  For instance, how
> would you know what ufsdump parameters to use, as far as how
> big the device is, tape length, etc?

You can specify a total block size to dump with -B.  It would, however, be
nice if dump had knowledge of tape devices designed in the past decade... ;-)