Hi!

Am Fre, 2003-01-24 um 16.22 schrieb Gene Heskett:
> On Friday 24 January 2003 08:53, Martin Oehler wrote:
> >Why is the length the same? Seems like switching the compression
> > modes with mt is not working.
> 
> It was still on?  You didn't say that you had turned it back off 
> above.  Maybe this drive has a compression scheme like the DDS 
> drives do, whereby it records the compression status in a hidden 
> header, and resets it to match that tape when the tape is next 
> scanned at insertion.  In which case see my rough outline of what 
> it takes to turn those flags off, in a previous message earlier 
> today.

I'm sorry, I made a mistake. The hardware compression was off
all the time. :(

# mt -f /dev/nrmt0 datcompression 0
Compression off.
# mt -f /dev/nrmt0 datcompression 1
Compression off.

I looked at IBMs ressources, but they offer drivers only for
RedHat and older SuSE distributions, but I'm using SuSE 8.1 .
Is it possible that the drive is that slow because I'm using 
native linux drivers?
 
> >Additionally, I can't understand why the speed is that slow. The
> > drive should write about 15 MB/sec without HC. Is it possible to
> > ignore the measured speed and use the one from the datasheet of
> > the tape?
> 
> How fast is the interface?  Maybe it can't to 15 megs a second, 
> older scsi stuff was hard pressed to do 5 megs, often less.  Much 
> less.

The interface is an Adaptec AIC-7899P U160.

> >The used amanda version is amanda-2.4.3 .
> 
> Which snapshot?  It should have a date string after the 2.4.3.

The newest entry inside the ChangeLog is 2002-10-07.

Regards,
Martin Öhler