Sorry all, messed my units up.

The manual that arrived with our LTO drive gives the capacity 
as 200 Gbytes with a 2:1 compression ratio. So we would expect
to put 100 Gbytes of data to the tape with HW compression 
disabled and the 200 GBtytes is an 'optimistic' estimate with
HW compression enabled.

> SYSLOG - Amanda on INFO
> 
> I had the tape drive incorrectly configured in amanda.conf to have
> a capacity of 100,000 Gbytes. This is the proper capacity with no
> compression but incorrect for hardware compression where we will
> estimate 200 000 GBytes (If amanda uses SW compression the 100000
> Gbytes is the correct setting for physical tape capacity).
> 
> I've updated the tape capacity and also set the switch to "no record"
> so that the weekend level 0 does not throw off the 5x/week tape cycle
> we perform from newtonr and newtonl configurations. This will have the
> effect of increasing the amount of data to the daily tape pools.
> 
> Based on the latest amanda report we may have finally reached the
> point where the 2nd tape will come into play on the weekly level 0
> dumps. This will give us a tape cycle of 13 rather than 27 weeks 
> which is still 3x the life of the other amanda configs where we
> consume (avg) 20 tapes in 4 weeks.
> 
> If tape capacity estimation becomes an issue we can change to SW
> compression but HW compression has worked out really really well
> for us so far.
> 
> Paul - thank you.
> 
> > You seem to have a tapecapacity of 100 Gbyte, so amanda scheduled up
> > to 200 Gbyte (for 2 runtapes).  To do this it needed to do some
> > level 1 instead of full dumps.
> > But actually your tapes *are* bigger, and amanda put all the 200 GByte
> > on one tape only in reality.  But that was after the schedule was decided.
> > 
> > Are these 200 Gbyte native tapes? Change your tape definition to 200 Gbyte.
> > If you use hardware compression, you may put a (safe) guess what will 
> > fit on a tape, e.g. 200 Gbyte.
> > 
> > Paul Bijnens, Xplanation                            Tel  +32 16 397.511
> > Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM    Fax  +32 16 397.512
> > http://www.xplanation.com/          email:  Paul.Bijnens AT xplanation DOT 
> > com