Method, electronic device and computer program product for managing storage unit

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 for execution by the at least one processing unit, wherein when executed by the at least one processing unit, the instructions cause the electronic device to perform actions comprising:
• if it is determined that a first metadata storage unit storing metadata of a plurality of storage units fails, allocating a second metadata storage unit to replace the first metadata storage unit from a storage resource pool, wherein the metadata of the plurality of storage units is read into a memory before the failure occurs, and first metadata of the first metadata storage unit is recorded in configuration information indicating a valid metadata storage unit, wherein the storage resource pool comprises a plurality of disks, wherein each one of the disks is divided into a plurality of disk slices, and wherein the metadata of the plurality of storage units includes mapping information indicating which ones of the plurality of disk slices located on the disks in the storage resource pool are occupied by each individual one of the plurality of storage units;
• recording second metadata of the second metadata storage unit in the configuration information;
• storing the metadata of the plurality of storage units in the memory into the second metadata storage unit;
• and
• replacing the first metadata storage unit with the second metadata storage unit by validating the second metadata and invalidating the first metadata in the configuration information.

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

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• if it is determined that a first metadata storage unit storing metadata of a plurality of storage units fails, allocating a second metadata storage unit to replace the first metadata storage unit from a storage resource pool, wherein the metadata of the plurality of storage units is read into a memory before the failure occurs, and first metadata of the first metadata storage unit is recorded in configuration information indicating a valid metadata storage unit, wherein the storage resource pool comprises a plurality of disks, wherein each one of the disks is divided into a plurality of disk slices, and wherein the metadata of the plurality of storage units includes mapping information indicating which ones of the plurality of disk slices located on the disks in the storage resource pool are occupied by each individual one of the plurality of storage units;
• recording second metadata of the second metadata storage unit in the configuration information;
• storing the metadata in the memory into the second metadata storage unit;
• and
• replacing the first metadata storage unit with the second metadata storage unit by validating the second metadata and invalidating the first metadata in the configuration information.