Rebuilding data previously stored on a failed data storage drive

A data storage system comprising:

• at least one storage processor including processing circuitry and a memory;
• a plurality of non-volatile data storage drives communicably coupled to the storage processor;
• and
• wherein the memory has program code stored thereon, wherein the program code, when executed by the processing circuitry, causes the processing circuitry to:
• perform a drive rebuild operation by causing the processing circuitry to periodically:
• calculate a target rebuild rate that enables data previously stored on the failed data storage drive to be completely rebuilt on at least one other data storage drive within an expected drive rebuild time window;
• calculate a new value for at least one drive rebuild parameter based on a value for the drive rebuild parameter corresponding to the target rebuild rate indicated by a static rebuild rate data structure and a current level of host I/O (Input/Output) activity;
• and
• rebuild the data previously stored on the failed data storage drive on the replacement data storage drive for a predetermined time period with the at least one drive rebuild parameter set to the new value for the drive rebuild parameter.

A computer program product including a non-transitory computer readable medium having instructions stored thereon, wherein the instructions, when executed on processing circuitry, cause the processing circuitry to perform steps including:

• calculating a target rebuild rate that enables data previously stored on the failed data storage drive to be completely rebuilt on at least one other data storage drive within an expected drive rebuild time window;
• calculating a new value for at least one drive rebuild parameter based on a value for the drive rebuild parameter corresponding to the target rebuild rate indicated by a static rebuild rate data structure and a current level of host I/O (Input/Output) activity;
• and
• rebuilding the data previously stored on the failed data storage drive on the replacement data storage drive for a predetermined time period with the at least one drive rebuild parameter set to the new value for the drive rebuild parameter.