Because the length of a checkpoint (the number of bytes per checkpoint) in the checkpoint data set can vary, you can only determine the number of cylinders to set aside for your checkpoint by trial and error.
On average the checkpoint can hold approximately 5,000 non-bundled report entries or 2,500 bundled report entries per cylinder. Those numbers are further reduced if reports belong to multiple bundles. Active report and bundle entries accumulate in the checkpoint during the daily cycle, so the checkpoint must be allocated large enough to hold a day's worth of active entries.
If, while running CA Deliver, you receive error message RMOCPT05 80 PERCENT UTILIZATION OF CHECKPOINT DSN=DATA SET NAME on your console, shut down CA Deliver, increase the number of cylinders allocated for your checkpoint with RMODBASE by 25%, then restart CA Deliver. You can run the RMOCPMAP utility to determine how the checkpoint space is being used.
Note: For best performance, place the checkpoint on a fast-write, cached device.
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