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Calculate Tape Management Catalog Storage Requirements

Use the following formula to calculate the Tape Management Catalog (TMC) storage requirements:

Cylinders = (3 + V + (D / 2)) / RC

V

The number of volume records.

D

The number of DSNB records.

RC

The records per cylinder for device type and blocking factor.

Note: Round up all values.

Example: TMC Storage Requirement

In this example, the values are 100,000 Volume records + 300,000 DSNB records (3380):

(3+100,000) + (300,000 / 2)) / 855 = 293 cylinders