Thanks Dave and Paul,
Help much appreciated.

BTW
I know tapetype, what is amtatype??


On Wed, 19 Feb 2003 00:22, Paul Bijnens wrote:
> Dave Ewall wrote:
> >I ran Tapetype on my Ultrium drive (came with a Dell Poweredge server),
> >and got this:
> >
> >define tapetype Ultrium {
> >    comment "Ultrium"
> >    length 101632 mbytes
> >    filemark 0 kbytes
> >    speed 13884 kbytes
> >}
> >
> >If I remember right, it took about an hour to run if I gave it the right
> >parameters.  I played with the parameters for a few days (in spare time)
> >before I got it right though... otherwise, it was running for daysIt s
>
> It should take about:
>
>     2 passes * (101632 * 1024 kbytes / 13884 kbytes/sec) /pass
>          = 14990 sec
>    or  about    4 hours 10 min.
>   + some time to rewind and stop/start at filemarks.
>
> The stop/start at filemarks is what makes it slower than expected.  The
> more files it has to write, the slower.
> The important parameter is a good guess of the length:
>
>     amtatype -s 100g
>
> would do it fine.  The program writes 100 files of 1 Gbyte each.  If you
> let it the default size estimate of 1Gbyte, then the program will write
> files of 100 Mbyte hoping it will have about 100 when hitting end of
> tape.  But now it needs to write 1000 files.  The second pass writes
> files of half the size, and will need to write 2000 files.  Now the
> start/stop time becomes sigificant in the total runtime, and the program
> becomes slow.
>
> Paul
>
> Paul
>
>
>
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Murray Taylor
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