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SUBSYS Can Fail on VSAM Clusters

IBM maintenance has introduced an 0C4 during subsystem OPEN when processing VSAM using the SUBSYS parameter. Because IBM is unwilling to fix the problem (APAR OW10331), jobs that have been working fail when this IBM maintenance is applied.

We strongly recommend that you change all uses of the SUBSYS parameter that process VSAM to the VSAM transparency as soon as possible.