Reason:
CADisk is performing I/O against the data set (ddd) on DD statement (xxx). The data set's extents are allocated in tracks, which are not on cylinder boundaries on a non-ECKD supported DASD device causing an I/O performance problem.
Action:
Allocate the data set in cylinders or move it to a device that supports ECKD channel protocol like ESCON or FICON.
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