Increased destaging efficiency by smoothing destaging between current and desired number of destage tasks

摘要

Techniques for increased destaging efficiency by smoothing destaging tasks to reduce long input/output (I/O) read operations are described. A system may comprise a processor device operable in the computing storage environment. The processor device calculates a current number of the destaging tasks and calculates a desired number of the destaging tasks. The processor device smoothes the destaging of the of the destaging tasks between the desired number of the destaging tasks and the current number of the destaging tasks by accelerating the calculating of the current number of the destaging tasks and the desired number of the destaging tasks, according to either a time interval or a variable recomputed destaging task interval, for reaching the desired number of the destaging tasks by decrementing the current number of destaging tasks or incrementing the current number of destaging tasks.

主权项

1. A system for increased destaging efficiency by smoothing destaging tasks to reduce long input/output (I/O) read operations in a computing storage environment, the system comprising:
a processor device and a memory operable in the computing storage environment, wherein the processor device:
calculates a current number of the destaging tasks, the current number of destaging tasks being a number of destaging task control blocks (TCBs) active on a rank of the memory,calculates a desired number of destaging tasks, the desired number of destaging tasks being a number of TCBs needed for the rank based upon a non-volatile storage (NVS) occupancy for the rank,smoothes the destaging of the destaging tasks between the desired number of the destaging tasks and the current number of the destaging tasks by expediting the calculating of the current number of the destaging tasks and the desired number of the destaging tasks, according to either a duration of time or a variable recomputed destaging task number, for reaching the desired number of the destaging tasks by decrementing the current number of destaging tasks or incrementing the current number of the destaging tasks, andsmoothes according to the duration of time when a delta value, which is the difference between the desired number of destaging tasks and the current number of destaging tasks, is less than a predetermined delta value;wherein the variable recomputed destaging task number is a time period equal to a variable time period obtained by historical data relating to the destaging of storage tracks divided by a delta value between the desired number of destaging tasks and the current number of destaging tasks.