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 > > > > ************************************************************************ > This Email has been scanned for Viruses by MailMarshal. > ************************************************************************ -- Murray Taylor Special Projects Engineer --------------------------------- Bytecraft Systems & Entertainment Phone: 61 3 8710 2555 Fax: 61 3 8710 2599 Direct: 61 3 9238 4275 Mobile: 61 0417 319 256 Email: [EMAIL PROTECTED] or visit us on the web http://www.bytecraftsystems.com http://www.bytecraftentertainment.com ************************************************************************ This Email has been scanned for Viruses by MailMarshal. ************************************************************************