> If you use software compression however, amanda pipes the data through
> gzip before writing to tape.  This has two advantages:  gzip does not
> suffer from the "expand already compressed data" syndrome, and amanda
> has an exact knowledge how much bytes to write on the tape.
> The added accuracy greatly improves the planning capacities of amanda.
> Amanda really likes to schedule using accurate numbers.

Paul,

The problem I have with using software compression is that it adds
several hours to the "estimate phase." Am I doing something wrong? Does
Amanda run the gzip ones to get the output size before running gzip
again when performing the actual dump?

Thanks and regards,

Ivan