Abstract: To manage a storage system, data objects are divided to groups according to keyword ranges of the data objects in the storage system. Array sets associated with the groups are respectively generated. An array in the array set includes elements. The elements are set according to a keyword of at least one data object in the group and at least one hash function. At least a part of the arrays in the array sets respectively associated with the groups is loaded into a memory of the storage system. The storage system is managed based on at least the part of the arrays in the memory. Further, a corresponding device and a corresponding computer program product are provided. With the above example implementation, only a part of the arrays is loaded into the memory of the storage system, so that the overhead of memory resources can be reduced.

Abstract: Data processing techniques comprise, in response to determining that a storage unit storing first data blocks is damaged, determining storage units associated with the storage unit, and obtaining second data blocks from the storage units, where the second data blocks and the first data blocks are generated by applying to data an error correction code in a first format. The method further comprises recovering the first data blocks based on the second data blocks. In addition, the method comprises generating error correction blocks by applying an error correction code in a second format to the recovered first data blocks, where the second format is different from the first format. The above techniques can reduce input/output operations and shortens the recovery time of data blocks, and further can reduce the risk of data loss even in an extremely bad situation.

Abstract: Embodiments of the present disclosure provide a method, an electronic device and a computer-readable medium for managing metadata. The method disclosed herein comprises: obtaining a check marker from a remote device; determining whether the check marker indicates that user data and metadata have been backed up in the remote device, the user data and the metadata being generated by an operation executed by a user on an object; and in response to the check marker indicating that the user data and the metadata have been backed up in the remote device, marking the metadata as removable metadata. In this way, the embodiments of the present disclosure can improve garbage collection efficiency of a storage system and execution efficiency of a metadata integration task.

Abstract: To manage a storage system, data objects are divided to groups according to keyword ranges of the data objects in the storage system. Array sets associated with the groups are respectively generated. An array in the array set includes elements. The elements are set according to a keyword of at least one data object in the group and at least one hash function. At least a part of the arrays in the array sets respectively associated with the groups is loaded into a memory of the storage system. The storage system is managed based on at least the part of the arrays in the memory. Further, a corresponding device and a corresponding computer program product are provided. With the above example implementation, only a part of the arrays is loaded into the memory of the storage system, so that the overhead of memory resources can be reduced.

Abstract: The present disclosure relates to a method, apparatus and computer program product for managing a storage system. According to implementations of the present disclosure, there is provided a method for managing a storage system. In the method, an object vector is created based on multiple objects stored in the storage system, here an object element in the object vector is associated with at least one object among the multiple objects. Multiple chunks included in the storage system are divided into multiple groups. For a group among the multiple groups, a chunk vector is created based on each chunk in the group, here a chunk element in the chunk vector is associated with a chunk in the group. A mapping matrix is created for managing the storage system based on the object vector and the chunk vector. Moreover, there is provided an apparatus and computer program product for managing a storage system.

Abstract: Data processing techniques comprise, in response to determining that a storage unit storing first data blocks is damaged, determining storage units associated with the storage unit, and obtaining second data blocks from the storage units, where the second data blocks and the first data blocks are generated by applying to data an error correction code in a first format. The method further comprises recovering the first data blocks based on the second data blocks. In addition, the method comprises generating error correction blocks by applying an error correction code in a second format to the recovered first data blocks, where the second format is different from the first format. The above techniques can reduce input/output operations and shortens the recovery time of data blocks, and further can reduce the risk of data loss even in an extremely bad situation.

Abstract: Embodiments of the present disclosure provide a method, an electronic device and a computer-readable medium for managing metadata. The method disclosed herein comprises: obtaining a check marker from a remote device; determining whether the check marker indicates that user data and metadata have been backed up in the remote device, the user data and the metadata being generated by an operation executed by a user on an object; and in response to the check marker indicating that the user data and the metadata have been backed up in the remote device, marking the metadata as removable metadata. In this way, the embodiments of the present disclosure can improve garbage collection efficiency of a storage system and execution efficiency of a metadata integration task.

Abstract: The present disclosure relates to a method, apparatus and computer program product for managing a storage system. According to implementations of the present disclosure, there is provided a method for managing a storage system. In the method, an object vector is created based on multiple objects stored in the storage system, here an object element in the object vector is associated with at least one object among the multiple objects. Multiple chunks included in the storage system are divided into multiple groups. For a group among the multiple groups, a chunk vector is created based on each chunk in the group, here a chunk element in the chunk vector is associated with a chunk in the group. A mapping matrix is created for managing the storage system based on the object vector and the chunk vector. Moreover, there is provided an apparatus and computer program product for managing a storage system.