| CPC G06F 3/0607 (2013.01) [G06F 3/0631 (2013.01); G06F 3/0689 (2013.01)] | 17 Claims |
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1. A computer program product, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform operations for:
creating arrays for different drive types, wherein drives in each of the arrays are certified at a same performance level and are of a same drive type;
running performance benchmarks for each of the arrays to compute a stage maximum value and a destage maximum value for each of the drive types;
at run time, in response to determining that a mode indictor indicates a uniform performance mode,
setting a maximum number of stage Task Control Blocks (TCBs) to a stage maximum uniform value that comprises a minimum of the stage maximum values obtained across the drive types;
setting a maximum number of destage TCBs to a destage maximum uniform value that comprises a minimum of the destage maximum values obtained across the drive types; and
adding a first delay to completion of a stage and a second delay to completion of a destage for uniform performance across the drive types;
performing the stage of first data using an actual number of stage TCBs that do not exceed the maximum number of stage TCBs and based on the first delay; and
performing the destage of second data using an actual number of destage TCBs that do not exceed the maximum number of destage TCBs and based on the second delay.
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