Roy Lake wrote:
> We used to have CLIENT compression set to YES when doing backups, with
DRIVE
> compression OFF. Most of the data on our systems is Oracle.  When we had
> client compression set to YES, each cartridge would take about 5GB.
>
> ...when I switched compression OFF, we managed to get around 21GB on each
> cart, and also the backups were a LOT quicker...
>
> Could someone please explain WHY compression is required if we get more
> on tape with it switched OFF, and the backups are quicker?.

Are you SURE drive compression is [still] turned off?  If it is off, you
should get the same amount of data on the same type of tape, no matter what.
So I reckon your drives ARE compressing the data.

The backups could be quicker because (a) the client isn't using CPU cycles
to do compression, and/or (b) maybe your network hardware is doing some
compression.

--
Lesley Walker
Lesley Walker
Unix Engineering, EDS New Zealand
Lesley.Walker AT eds DOT com
"I feel that there is a world market for as many as five computers"
    Thomas Watson, IBM corp. - 1943