Only one dumper running

[Ben Elliston]

I'm doing a test run with about 8 entries in my disklist and Amanda is only
running one dumper.  When I run `amstatus' I see:

3 dumpers idle  : no-diskspace
taper idle
network free kps:     1984
holding space   :   806496k ( 76.91%)

What does `no-diskspace' mean here?  I seem to have free network capacity,
so why aren't up to 4 dumpers (as I've configured) running?

Ben