Tape-capacity optimization tape environment with global scratch pool for library and nonlibrary environments

Figure 1 shows a tape environment that is recommended for sites that want to optimize utilization of tape cartridges.

Figure 1. Recommended Tape Processing Environment that Maximizes Tape Capacity. This tape environment differs from the performance tape environment only in the way partially filled tapes are managed. Because partially filled tapes are selected the next time the same function runs, the tape’s media is fully utilized.

Table 1 is a summary of tape-capacity optimization considerations in a global scratch pool environment.

Table 1. Summary: Tape-Capacity Optimization Global Scratch Pool Environment
Tape Environment Definition	Features	Trade-offs
SETSYS - SELECTVOLUME(SCRATCH) - TAPEDELETION(SCRATCHTAPE) - PARTIALTAPE(REUSE)	Utilizes full tape capacity for both original and alternate tapes Effective for tape libraries Requires less recycle time than the performance tape environment because fewer tapes need to be recycled	Does not fully exploit cartridge loaders for the first mount of each task, of each function, each day. TAPECOPY processing does not copy the final tape of each task until that tape is filled.