Method and devices for managing cache

A cache manager, the cache comprising a plurality of storage blocks, the cache manager comprising:

• a processor;
• and
• a memory having computer program instructions stored thereon, the processor executing the computer program instructions in the memory to control the memory system to perform acts comprising:
• determining a cache flush time period of the cache for a lower-layer storage device associated with the cache;
• and
• in response to a length of the cache flush time period being longer than a threshold length of time,
• in response to receiving a write request, determining whether data associated with the write request has been stored into the cache, and
• in response to a miss of the data in the cache, storing the write request and the data in the cache without returning a write completion message for the write request.

A computer program product for managing cache, comprising:

• a non-transitory computer readable medium encoded with computer-executable code, the code configured for the execution of:
• determining a cache flush time period of the cache for a lower-layer storage device associated with the cache;
• and
• in response to a length of the cache flush time period being longer than a threshold length of time,
• in response to receiving a write request, determining whether data associated with the write request has been stored into the cache, and
• in response to a miss of the data in the cache, storing the write request and the data in the cache without returning a write completion message for the write request.