Re: [Dump-users] [HELP]: Dumpsize miscalculations...

[Bernhard E. <be...@be...>]

Kenneth Porter wrote:
> 
> On Fri, 30 Jun 2000 20:35:17 +0100 (IST), Chris Bradshaw wrote:
> 
> >When I run the dump command, it seems to wildly miscalulate
> >how many tapes it will need to fit my dumps. For example, it
> >tells me it needs 34.57 tapes to dump ~800Mb onto a DDS
> >SCSI tape drive.
> 
> Dump assumes a fairly ancient tape technology. You need to override its
> assumptions with the b and B options. "man dump".

Yeah, read about dump in "Unix System Administration" (Æleen Frisch)
from O'Reilly:

The values dump is based on are the characteristics of 9-track tapes.
For 4 mm tapes (DDS-1, 2 GB) they publish "-s 5000" (brit. feet) and "-d
42500" (bytes per inch). These aren't the actual values, they are
choosen for compatibility with older versions of dump.

As Stelian told you, you can use "-a" instead.