Method, electronic device and computer program product for restoring orphan block via replication

An electronic device, comprising:

• at least one processing unit;
• and
• at least one memory coupled to the at least one processing unit and storing instructions configured to be executed by the at least one processing unit, wherein the instructions, when executed by the at least one processing unit, cause the device to perform actions comprising:
• in response to determining that a source storage slice of a file system is to be recycled, identifying, from the source storage slice comprising a plurality of storage blocks, an orphan storage block that is inaccessible by a client of the file system;
• after the identifying, replicating data of the orphan storage block to a target storage block, the target storage block being located in a target storage slice within a predetermined isolation area of the file system;
• and
• after the identifying, generating second metadata of the target storage block based at least on first metadata of the orphan storage block, the second metadata comprising at least an identification of the orphan storage block.

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:
• in response to determining that a source storage slice of a file system is to be recycled, identifying, from the source storage slice comprising a plurality of storage blocks, an orphan storage block that is inaccessible by a client of the file system;
• after the identifying, replicating data of the orphan storage block to a target storage block, the target storage block being located in a target storage slice within a predetermined isolation area of the file system;
• and
• after the identifying, generating second metadata of the target storage block based at least on first metadata of the orphan storage block, the second metadata comprising at least an identification of the orphan storage block.