Method and apparatus for performing simple storage service seamless migration using index objects

A host device, comprising:

• a processing circuit, arranged to control the host device to perform index-object-based S3 migration management in a storage server, wherein the storage server comprises the host device and a storage device layer, the storage device layer comprises at least one storage device that is coupled to the host device, the host device is arranged to control operations of the storage server, and said at least one storage device is arranged to store information for the storage server, wherein:
• in response to a request of migrating user data of a user of the storage server from a remote S3-compatible server into the storage server, during an index stage among multiple stages of the migration of the user data, an index-object-based S3 migration management module among multiple program modules running on the processing circuit creates and stores multiple index objects into the storage device layer to be respective representatives of multiple normal objects of the user data at the storage server, and migrates respective Access Control Lists (ACLs) of the multiple normal objects to the storage server to be respective ACLs of the multiple index objects, for minimizing probability of any change of any normal object of the multiple normal objects affecting correctness of the migration of the user data;
• and
• during a data stage after the index stage among the multiple stages, the index-object-based S3 migration management module triggers one or more migration agents to migrate respective object data of a set of normal objects among the multiple normal objects from the remote S3-compatible server into the storage device layer of the storage server as respective replacements of a set of index objects among the multiple index objects, for completing the migration of the user data.

A storage server, comprising:

• a host device, arranged to control operations of the storage server, the host device comprising:
• a processing circuit, arranged to control the host device to perform index-object-based S3 migration management in the storage server;
• and
• a storage device layer, comprising:
• at least one storage device, coupled to the host device, arranged to store information for the storage server;
• wherein:
• in response to a request of migrating user data of a user of the storage server from a remote S3-compatible server into the storage server, during an index stage among multiple stages of the migration of the user data, an index-object-based S3 migration management module among multiple program modules running on the processing circuit creates and stores multiple index objects into the storage device layer to be respective representatives of multiple normal objects of the user data at the storage server, and migrates respective Access Control Lists (ACLs) of the multiple normal objects to the storage server to be respective ACLs of the multiple index objects, for minimizing probability of any change of any normal object of the multiple normal objects affecting correctness of the migration of the user data;
• and
• during a data stage after the index stage among the multiple stages, the index-object-based S3 migration management module triggers one or more migration agents to migrate respective object data of a set of normal objects among the multiple normal objects from the remote S3-compatible server into the storage device layer of the storage server as respective replacements of a set of index objects among the multiple index objects, for completing the migration of the user data.