Data migration method, host, and solid state disk

A system comprising:

• a host configured to send a data migration instruction comprising migration data information of to-be-migrated data;
• and
• solid-state disks (SSDs) coupled to the host and comprising:
• a target SSD comprising a target SSD cache;
• and
• a source SSD comprising a source SSD cache, wherein the source SSD cache is configured to store to-be-migrated data, and wherein the source SSD is configured to:
• receive the data migration instruction from the host;
• generate a read instruction corresponding to the data migration instruction, wherein the read instruction comprises access information of the target SSD cache;
• and
• execute the read instruction to read a to-be-migrated data block within the to-be-migrated data from the source SSD into the target SSD cache.

A source solid-state disk (SSD) comprising:

• a source SSD cache configured to store to-be-migrated data;
• and
• a controller configured to:
• receive, from a host, a data migration instruction comprising migration data information of the to-be-migrated data;
• generate a read instruction corresponding to the data migration instruction, wherein the read instruction comprises access information of a target SSD cache of a target SSD of the host;
• and
• execute the read instruction to read a to-be-migrated data block within the to-be-migrated data from the source SSD into the target SSD cache.