I solved the dump problem in a not very
clean way.
First I changed dumps behaviour to ignore
the SIGPIPE signal when the -P and -a option
is given. The problem with occured than was
the loss of data because of the race condition
between "write date to pipe" and "receive SIGPIPE".

I solved that problem with a script that
takes the data from the pipe of dump, compress
it and sends a dedicated SIGPIPE to the three
dump processes when the output volume is nealy full.
After that it flushs the rest out of the pipe to
avoid data loss.

Martin L.
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