HPUX 10.20 Dump to DDS2

[Tom Jackson_5]

I'm having problems getting 8GB to backup on my C1533A tape drive using DDS2
tapes. Please explain how to use the density and tape length options for the
dump command.

[Tom Jackson_5]

If I specify the correct density and tape length the estimates for the amount
of tape required are way too high (too many tapes). Here's the command that I
thought should have worked:

dump 0dsf 1816822 394 /dev/rmt/c1t3d0DDS2Cn /fs1

The command I'm currently using gives good estimates for amount of tape
required for the backup, but doesn't reflect the actual tape density or
length.

dump 0dsf 846023 15000 /dev/rmt/c1t3d0DDS2Cn /fs1

Please help me with the proper usage of the dump tape density and length
options. Thanks.