Abstract: Data is migrated. For instance, in response to detection of a failed group in a drive of groups comprising respective blocks, it is determined whether the total number of groups in the drive that have failed is less than a predetermined threshold. Data associated with the failed group is migrated to a reserved group in a reserved space of the drive according to a determination that the total number is less than the predetermined threshold; and a read/write (I/O) request to the failed group is redirected to the reserved group based on a mapping relationship from the failed group to the reserved group. Consequently, data does not need to be repaired on an entire drive due to one failed write request and replacing the drive is avoided, thereby saving resources, time and labor, and improving the impact of the failed write request on the performance of a storage system.

Abstract: File management is enabled for large numbers of files. Example file management includes setting a grouping identifier for a file. The method further includes determining a storage address of a data block of the file, the storage address indicating an extent where the data block is located and an offset. The method further includes setting, in a storage region of the extent corresponding to the grouping identifier, a flag for the data block based on the offset. In this manner, a large number of files in a distributed file system can be managed more efficiently.

Abstract: File management is enabled for large numbers of files. Example file management includes setting a grouping identifier for a file. The method further includes determining a storage address of a data block of the file, the storage address indicating an extent where the data block is located and an offset. The method further includes setting, in a storage region of the extent corresponding to the grouping identifier, a flag for the data block based on the offset. In this manner, a large number of files in a distributed file system can be managed more efficiently.

Abstract: Provided herein is a method, an electronic device, and a computer program product for managing a storage system. A method can comprise, in response to determining that a first storage unit of a storage system is faulty, writing, by a system comprising a processor, a data block stored in the first storage unit into a hidden file of the storage system. The hidden file can be distributed across at least a second storage unit and a third storage unit of the storage system, wherein the second storage unit and the third storage unit are different from the first storage unit. Writing the data block can comprise creating the hidden file in the storage system, and creating an index information item corresponding to the data block for the hidden file, which index information item indicates a physical address of the data block.

Abstract: Embodiments of the present disclosure relate to a method, an electronic device, and a computer program product for managing a storage system. The method includes: if it is determined that a first storage unit of the storage system is faulty, writing a data block stored in the first storage unit into a hidden file of the storage system, wherein the hidden file is distributed across at least a second storage unit and a third storage unit of the storage system, and the second storage unit and the third storage unit are different from the first storage unit. The embodiments of the present disclosure can better protect data in the storage system and improve the performance of the storage system, and are particularly beneficial to improving the performance of a delay-sensitive workflow.