Method, device, and program product for reducing delay in I/O processing due to mirroring of cache data

An electronic device, comprising:

• at least two processors;
• and
• at least one memory storing computer program instructions, the at least one memory and the computer program instructions being configured, together with the at least two processors, to cause the electronic device to:
• receive, at a second processor, user data and cache metadata from a first cache of a first processor, the cache metadata comprising information associated with writing the user data to the storage system;
• preprocess the cache metadata, such that the user data is accessible to a host via the second processor;
• and
• performing, in a second cache of the second processor, data processing related to cache mirroring based on the user data and the cache metadata;
• wherein preprocessing the cache metadata comprises:
• moving the cache metadata from a receiving buffer of the second cache to a queue of cache metadata accessible to the host.

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

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• receiving, at a second processor of a storage system, user data and cache metadata from a first cache of a first processor of the storage system, the cache metadata comprising information associated with writing the user data to the storage system;
• preprocessing the cache metadata, such that the user data is accessible to a host via the second processor;
• and
• performing, in a second cache of the second processor, data processing related to cache mirroring based on the user data and the cache metadata;
• wherein preprocessing the cache metadata comprises:
• moving the cache metadata from a receiving buffer of the second cache to a queue of cache metadata accessible to the host.

A method of storage management, comprising:

• receiving, at a second processor of a storage system, user data and cache metadata from a first cache of a first processor of the storage system, the cache metadata comprising information associated with writing the user data to the storage system;
• preprocessing the cache metadata, such that the user data is accessible to a host via the second processor;
• and
• performing, in a second cache of the second processor, data processing related to cache mirroring based on the user data and the cache metadata;
• wherein performing the data processing comprises:
• waking up a background thread to perform the data processing.

A method of storage management, comprising:

• receiving, at a second processor of a storage system, user data and cache metadata from a first cache of a first processor of the storage system, the cache metadata comprising information associated with writing the user data to the storage system;
• preprocessing the cache metadata, such that the user data is accessible to a host via the second processor;
• and
• performing, in a second cache of the second processor, data processing related to cache mirroring based on the user data and the cache metadata;
• and
• further comprising at least one of the following:
• in response to completion of the preprocessing, changing the processing state from an initial value of “valid” to “preprocessed;”
• in response to the data processing being in progress, setting the processing state to “processing;” and
• in response to the completion of the data processing, setting the processing state to “invalid.”