Resource Requirements

Resource requirements can help you decide when is the best time to run the CTTSBD utility. The duration of resource consumption depends primarily on the number of volumes selected for processing by the CTTSBD utility. Shown below is a description of the various resources used by this utility.

Table 367 CTTSBD Resource Requirements

Resource	Description
Disk processing	CTTSBD disk processing includes sequential processing of the Media database and multiple sort phases. In NORMAL mode, disk processing is performed during the selection phase only. After the first volume is mounted for copying, disk processing becomes minimal. In SIMULATION mode, volume selection is the primary action performed by the utility. In this mode, the utility runs faster even though disk processing continues during most of the run.
Tape processing	CTTSBD tape resource consumption is similar to that of any other tape-to-tape copy or backup program that uses two tape drives.
Memory Requirements	CTTSBD uses memory resident information about volumes and data sets. Storage is allocated as new volume chains are created. Virtual storage requirements for this utility depend on The number of output volume chains created by the utility. The maximum number of data sets allowed in each output volume chain.

Resource

Description

Disk processing

CTTSBD disk processing includes sequential processing of the Media database and multiple sort phases.

In NORMAL mode, disk processing is performed during the selection phase only. After the first volume is mounted for copying, disk processing becomes minimal.
In SIMULATION mode, volume selection is the primary action performed by the utility. In this mode, the utility runs faster even though disk processing continues during most of the run.

Tape processing

CTTSBD tape resource consumption is similar to that of any other tape-to-tape copy or backup program that uses two tape drives.

Memory Requirements

CTTSBD uses memory resident information about volumes and data sets. Storage is allocated as new volume chains are created. Virtual storage requirements for this utility depend on

The number of output volume chains created by the utility.
The maximum number of data sets allowed in each output volume chain.

Parent Topic

CTTSBD – Perform Data Set Stacking in Batch Mode