Method, device, and computer program product for managing storage system

A device for managing a storage system, the storage system comprising a plurality of stripes, a plurality of extents comprised in one stripe among the plurality of stripes residing on a plurality of storage devices in the storage system, respectively, the storage system comprising an address mapping between the stripe and a plurality of storage devices where the plurality of extents reside, the device comprising:

• at least one processor;
• 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 device to perform acts, including:
• determining a storage device where the extent resides among the plurality of storage devices based on the address mapping;
• adding the stripe to a rebuild list of the storage system in accordance with determining the storage device is a failed storage device, the rebuild list comprising a stripe that is to be rebuilt in the storage system;
• and
• rebuilding the storage system based on stripes in the rebuild list;
• wherein the storage system further comprises a metadata bitmap, one bit in the metadata bitmap being used to indicate whether one stripe among the plurality of stripes has been used or not;
• and
• wherein the metadata bitmap resides in one server in the storage system which is used to process read requests and write requests to the storage system, the storage system further comprising a further server, the acts further comprising:
• in accordance with determining the metadata bitmap has been updated, synchronizing the updated metadata bitmap to the further server.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to manage a storage system comprising a plurality of stripes, a plurality of extents comprised in one stripe among the plurality of stripes residing on a plurality of storage devices in the storage system, respectively, the storage system comprising an address mapping between the stripe and a plurality of storage devices where the plurality of extents reside;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• regarding one extent among the plurality of extents,
• determining a storage device where the extent resides among the plurality of storage devices based on the address mapping;
• adding the stripe to a rebuild list of the storage system in accordance with determining the storage device is a failed storage device, the rebuild list comprising a stripe that is to be rebuilt in the storage system;
• and
• rebuilding the storage system based on stripes in the rebuild list;
• wherein the storage system further comprises a metadata bitmap, one bit in the metadata bitmap being used to indicate whether one stripe among the plurality of stripes has been used or not;
• and
• wherein the metadata bitmap resides in one server in the storage system which is used to process read requests and write requests to the storage system, the storage system further comprising a further server, the method further comprising:
• in accordance with determining the metadata bitmap has been updated, synchronizing the updated metadata bitmap to the further server.