VSAM tableBASE libraries

For VSAM libraries, the default blocksize of 3120 (RECSZ in IDCAMS DEFINE) results in a CISZ of 3584, 13 blocks per track and 71.6% utilization. Increasing the RECSZ to 3577 (the maximum in a 3584 CISZ) results in a 82.1% utilization. Increasing it to 4091 (the maximum in a 4096 CISZ) results in 86.6% utilization. Reducing it to 2041 (2048 CISZ) results in 75.6% utilization; reducing it to 1017 (1024 CISZ) yields 59.2% utilization.