Method, apparatus and computer program product for managing storage system

An apparatus for managing a storage system, comprising:

• at least one processor;
• a volatile memory;
• and
• a memory coupled to the at least one processor and having instructions stored thereon, the instructions, when executed by the at least one processor, causing the apparatus to perform acts comprising:
• obtaining respective response times of multiple storage devices associated with the storage system,
• selecting an extent, whose workload satisfies a predefined condition, as a source extent from multiple extents on a source storage device in response to a response time of the source storage device among the multiple storage devices being above a predefined threshold,
• selecting a destination storage device from the multiple storage devices, the destination storage device having a lower workload than the source storage device, and
• moving data on the source extent to a free extent on the destination storage device.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to manage a storage system;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• obtaining respective response times of multiple storage devices associated with the storage system;
• selecting an extent, whose workload satisfies a predefined condition, as a source extent from multiple extents on a source storage device in response to a response time of the source storage device among the multiple storage devices being above a predefined threshold;
• selecting a destination storage device from the multiple storage devices, the destination storage device having a lower workload than the source storage device;
• and
• moving data on the source extent to a free extent on the destination storage device.