The density (format) parameter controls the optimum block size
that the volume will use so the created volume will be compatible for duplication
to your physical tape device.
- Volumes with a Density of *VRT256K will use an optimum block size of 256KB.
- Volumes with a Density of *VRT240K will use an optimum block size of 240KB.
- Volumes with a Density of *VRT64K will use an optimum block size of 64KB.
- Volumes with a Density of *VRT32K will not use an optimum block size and
will be compatible with all devices.
You want to pick the largest compatible optimum block size to maximize
performance. The Initialize Tape (INZTAP) command can be used to change the
density of an existing volume.
Note: Initialize tape (INZTAP) removes any
existing data on the tape.
