Method, electronic device and computer program product for storage management

An electronic device, comprising:

• a controller configured to manage a storage system;
• and
• at least one memory coupled to the controller and storing instructions executed by the controller, the instructions, when executed by the controller, causing the device to perform acts comprising:
• determining a source disk slice from a plurality of disk slices of a plurality of storage arrays providing redundant storage, target data on the source disk slice needing to be removed;
• determining a destination disk slice for storing the target data needing to be removed from the source disk slice, a destination disk where the destination disk slice is located being different from a source disk where the source disk slice is located, the plurality of storage arrays including a target storage array associated with the source disk;
• in response to receiving, at the controller, a start message from a mapper configured to maintain a mapping relationship between a logical address space and a physical address space of the storage system:
• moving the target data from the source disk slice to the destination disk slice;
• and
• setting, by the controller, a moving in progress field for the target storage array to be valid;
• and
• in response to receiving, at the storage system, a write access request involving the source disk slice:
• determining, by the controller, that the moving in progress field for the target storage array is set to be valid;
• and
• in response to determining that the moving in progress field for the target storage array is set to be valid, writing, by the controller, data for the write access request into the destination disk slice in addition to moving, by the controller, the target data from the source disk slice to the destination disk slice.

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 for storage management in a storage system, the method comprising:
• determining, by a controller configured to manage the storage system, a source disk slice from a plurality of disk slices of a plurality of storage arrays providing redundant storage, target data on the source disk slice needing to be removed;
• determining, by the controller, a destination disk slice for storing the target data needing to be removed from the source disk slice, a destination disk where the destination disk slice is located being different from a source disk where the source disk slice is located, the plurality of storage arrays including a target storage array associated with the source disk;
• in response to receiving, at the controller, a start message from a mapper configured to maintain a mapping relationship between a logical address space and a physical address space of the storage system:
• moving, by the controller, the target data from the source disk slice to the destination disk slice;
• and
• setting, by the controller, a moving in progress field for the target storage array to be valid;
• and
• in response to receiving, at the storage system, a write access request involving the source disk slice:
• determining, by the controller, that the moving in progress field for the target storage array is set to be valid;
• and
• in response to determining that the moving in progress field for the target storage array is set to be valid, writing, by the controller, data for the write access request into the destination disk slice in addition to moving, by the controller, the target data from the source disk slice to the destination disk slice.