Method, device, and computer program product for managing stripe in storage system

A method for managing stripes in a storage system which includes a first number of storage devices, the method comprising:

• determining, according to a received request for creating a stripe in the storage system, a type of the stripe;
• acquiring a first workload distribution corresponding to the determined type, wherein the first workload distribution describes the distribution, among the first number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• selecting a set of extents from the first number of storage devices based on the first workload distribution, so that the distribution, among the first number of storage devices, of the selected set of extents and the multiple extents in the set of stripes of this type satisfies a preset distribution condition associated with the type;
• and
• using the selected set of extents to create the requested stripe based on a stripe creation rule associated with the type;
• wherein acquiring the first workload distribution corresponding to the determined type includes:
• according to a determination that the storage system does not include a stripe of this type,
• creating the first workload distribution according to the first number, wherein the first workload distribution indicates that there is no stripe of this type in the first number of storage devices.

An electronic device, comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, wherein the memory has instructions stored therein, the instructions, when executed by the at least one processor, cause the device to perform an action for managing stripes in a storage system that includes a first number of storage devices, and the action includes:
• determining, according to a received request for creating a stripe in the storage system, a type of the stripe;
• acquiring a first workload distribution corresponding to the determined type, wherein the first workload distribution describes the distribution, among the first number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• selecting a set of extents from the first number of storage devices based on the first workload distribution, so that the distribution, among the first number of storage devices, of the selected set of extents and the multiple extents in the set of stripes of this type satisfies a preset distribution condition associated with the type;
• using the selected set of extents to create the requested stripe based on a stripe creation rule associated with the type;
• and
• according to a determination that the number of the storage devices in the storage system is changed from the first number to a second number,
• acquiring a second workload distribution corresponding to the determined type, wherein the second workload distribution describes the distribution, among the second number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• and
• migrating at least a portion of the extents in the set of stripes based on the second workload distribution.

An electronic device, comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, wherein the memory has instructions stored therein, the instructions, when executed by the at least one processor, cause the device to perform an action for managing stripes in a storage system that includes a first number of storage devices, and the action includes:
• determining, according to a received request for creating a stripe in the storage system, a type of the stripe;
• acquiring a first workload distribution corresponding to the determined type, wherein the first workload distribution describes the distribution, among the first number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• selecting a set of extents from the first number of storage devices based on the first workload distribution, so that the distribution, among the first number of storage devices, of the selected set of extents and the multiple extents in the set of stripes of this type satisfies a preset distribution condition associated with the type;
• and
• using the selected set of extents to create the requested stripe based on a stripe creation rule associated with the type;
• wherein acquiring the first workload distribution corresponding to the determined type includes:
• according to a determination that the storage system does not include a stripe of this type,
• creating the first workload distribution according to the first number, wherein the first workload distribution indicates that there is no stripe of this type in the first number of storage devices.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to manage stripes in a storage system which includes a first number of storage devices;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• determining, according to a received request for creating a stripe in the storage system, a type of the stripe;
• acquiring a first workload distribution corresponding to the determined type, wherein the first workload distribution describes the distribution, among the first number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• selecting a set of extents from the first number of storage devices based on the first workload distribution, so that the distribution, among the first number of storage devices, of the selected set of extents and the multiple extents in the set of stripes of this type satisfies a preset distribution condition associated with the type;
• using the selected set of extents to create the requested stripe based on a stripe creation rule associated with the type;
• and
• according to a determination that the number of the storage devices in the storage system is changed from the first number to a second number,
• acquiring a second workload distribution corresponding to the determined type, wherein the second workload distribution describes the distribution, among the second number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• and
• migrating at least a portion of the extents in the set of stripes based on the second workload distribution.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to manage stripes in a storage system which includes a first number of storage devices;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• determining, according to a received request for creating a stripe in the storage system, a type of the stripe;
• acquiring a first workload distribution corresponding to the determined type, wherein the first workload distribution describes the distribution, among the first number of storage devices, of multiple extents in a set of stripes of this type in the storage system;
• selecting a set of extents from the first number of storage devices based on the first workload distribution, so that the distribution, among the first number of storage devices, of the selected set of extents and the multiple extents in the set of stripes of this type satisfies a preset distribution condition associated with the type;
• and
• using the selected set of extents to create the requested stripe based on a stripe creation rule associated with the type;
• wherein acquiring the first workload distribution corresponding to the determined type includes:
• according to a determination that the storage system does not include a stripe of this type,
• creating the first workload distribution according to the first number, wherein the first workload distribution indicates that there is no stripe of this type in the first number of storage devices.