Abstract: Embodiments of the present disclosure provide a method and device for deduplication. Specifically, the method may comprise obtaining a property of a file stream, the property of a file stream including a file type or a magic number identifying a format of a protocol or a file. The method further includes in response to receiving an I/O request for a data block of the file stream, assigning a deduplication level to the I/O request based on the property of the file stream. Moreover, the method further includes deduplicating the data block of the file stream based on the deduplication level assigned to the I/O request. In addition, a corresponding device and computer program product are provided.

Abstract: Embodiments of the present disclosure provide a method, a device, and a computer program product for storage management. The method for storage management includes: acquiring a reading request for a first target file, the reading request including a first target file name of the first target file. The method further includes: determining a first target characteristic value for the first target file based on the first target file name. The method further includes: determining first target index information for the first target file from a mapping from characteristic values to index information based on the first target characteristic value, wherein the first target index information is used to index the first target file from a merged file. The method further includes: reading the first target file included in the merged file from a storage system based on the first target index information.

Abstract: Embodiments of the present disclosure provide a method and device for a file system log. In some embodiments, there is provided a computer-implemented method. The method comprises: in response to receiving a write request for metadata associated with a first transaction, determining at least one zone associated with the first transaction from a plurality of zones of the metadata, the plurality of zones being formed by striping the metadata; requesting a resource slice for the at least one zone from a resource pool of a logging system; and recording to the resource slice a log that the first transaction modifies the at least one zone.

Abstract: Embodiments of the present disclosure relate to method and device for data read/write. The method comprises: in response to receiving a first read/write request for a first target area, determining whether there is a second read/write request under execution in conflict with the first read/write request, a second target area for the second read/write request at least partially overlapping with the first target area, and at least one of the first read/write request and the second read/write request being a write request; and in response to determining there being the second read/write request in conflict, suspending the first read/write request while maintaining a sub-area of the first target area in an unlocked state, the sub-area not overlapping with the second target area.

Abstract: Embodiments of the present disclosure provide a method and device for deduplication. Specifically, the method may comprise obtaining a property of a file stream, the property of a file stream including a file type or a magic number identifying a format of a protocol or a file. The method further includes in response to receiving an I/O request for a data block of the file stream, assigning a deduplication level to the I/O request based on the property of the file stream. Moreover, the method further includes deduplicating the data block of the file stream based on the deduplication level assigned to the I/O request. In addition, a corresponding device and computer program product are provided.

Abstract: Embodiments of the present disclosure provide a method and device for deduplication. Specifically, the method may comprise obtaining a property of a file stream, the property of a file stream including a file type or a magic number identifying a format of a protocol or a file. The method further includes in response to receiving an I/O request for a data block of the file stream, assigning a deduplication level to the I/O request based on the property of the file stream. Moreover, the method further includes deduplicating the data block of the file stream based on the deduplication level assigned to the I/O request. In addition, a corresponding device and computer program product are provided.

Abstract: A method, apparatus, and computer program product for reclaiming one or more chunks in a snapshot storage space, are disclosed. The method comprises detecting one or more unused chunks in the snapshot storage space in response to a predefined trigger event, and reclaiming one or more detected unused chunks by providing the one or more detected unused chunks to a storage pool for reuse. One or more unused chunks may be detected by scanning a first mapping table that records a storage state of a plurality of chunks in the snapshot storage space, and a determination made whether the one or more detected unused chunks have been reclaimed. If the one or more detected unused chunks have not been reclaimed, the one or more detected unused chunks may be provided to the storage pool and a second mapping table updated to record a reclaiming state of the one or more unused chunks. A new snapshot may be stored using a chunk in the snapshot storage space that has not been used and has not been reclaimed yet.

Abstract: Implementations of the present disclosure relate to a method, system and computer program product for managing a storage system. Specifically, in one implementation of the present disclosure, there is provided a method for managing a storage system. The method comprises: obtaining topological information of a storage device in a first tier and a storage device in a second tier in the storage system; obtaining a storage rule specifying storage of a data object in the storage device in the first tier or the storage device in the second tier; and in response to determining the storage rule conforming to the topological information, managing the data object in the storage system according to the storage rule. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.

Abstract: Embodiments of the present disclosure relate to method and device for data read/write. The method comprises: in response to receiving a first read/write request for a first target area, determining whether there is a second read/write request under execution in conflict with the first read/write request, a second target area for the second read/write request at least partially overlapping with the first target area, and at least one of the first read/write request and the second read/write request being a write request; and in response to determining there being the second read/write request in conflict, suspending the first read/write request while maintaining a sub-area of the first target area in an unlocked state, the sub-area not overlapping with the second target area.

Abstract: Embodiments of the present disclosure relate to method and device for data read/write. The method comprises: in response to receiving a first read/write request for a first target area, determining whether there is a second read/write request under execution in conflict with the first read/write request, a second target area for the second read/write request at least partially overlapping with the first target area, and at least one of the first read/write request and the second read/write request being a write request; and in response to determining there being the second read/write request in conflict, suspending the first read/write request while maintaining a sub-area of the first target area in an unlocked state, the sub-area not overlapping with the second target area.

Abstract: Embodiments of the present disclosure relate to a method and apparatus for locking a file in a memory. The method comprises enabling a thread to obtain a mixed lock of a file. The method further comprises, in response to enabling the thread to obtain the mixed lock, enabling a further thread to obtain a shared lock of the file, and prevent the further thread from obtaining the exclusive lock or mixed lock of the file. By adding a new mixed lock to a traditional read and write lock, embodiments of the present disclosure improve concurrent access performance of the file system.

Abstract: Various embodiments of the present invention provide a method and apparatus for reusing a storage block of a file system. The file system is based on a thin provision storage configuration and shares a storage pool with a further file system. The method comprises detecting an unused storage block in a storage space of the file system in response to a predefined trigger event. The method further comprises in response to an unused storage block being detected in the storage space, providing the unused storage block to the storage pool for being reused. According to various embodiments of the present invention, effective utilization of the storage space of the storage pool is achieved.

Abstract: Embodiments of the present disclosure provide a method and device for deduplication. Specifically, the method may comprise obtaining a property of a file stream, the property of a file stream including a file type or a magic number identifying a format of a protocol or a file. The method further includes in response to receiving an I/O request for a data block of the file stream, assigning a deduplication level to the I/O request based on the property of the file stream. Moreover, the method further includes deduplicating the data block of the file stream based on the deduplication level assigned to the I/O request. In addition, a corresponding device and computer program product are provided.

Abstract: Embodiments of the present disclosure provide a method and device for a file system log. In some embodiments, there is provided a computer-implemented method. The method comprises: in response to receiving a write request for metadata associated with a first transaction, determining at least one zone associated with the first transaction from a plurality of zones of the metadata, the plurality of zones being formed by striping the metadata; requesting a resource slice for the at least one zone from a resource pool of a logging system; and recording to the resource slice a log that the first transaction modifies the at least one zone.

Abstract: Embodiments of the present disclosure relate to method and device for data read/write. The method comprises: in response to receiving a first read/write request for a first target area, determining whether there is a second read/write request under execution in conflict with the first read/write request, a second target area for the second read/write request at least partially overlapping with the first target area, and at least one of the first read/write request and the second read/write request being a write request; and in response to determining there being the second read/write request in conflict, suspending the first read/write request while maintaining a sub-area of the first target area in an unlocked state, the sub-area not overlapping with the second target area.

Abstract: Implementations of the present disclosure relate to a method, system and computer program product for managing a storage system. Specifically, in one implementation of the present disclosure, there is provided a method for managing a storage system. The method comprises: obtaining topological information of a storage device in a first tier and a storage device in a second tier in the storage system; obtaining a storage rule specifying storage of a data object in the storage device in the first tier or the storage device in the second tier; and in response to determining the storage rule conforming to the topological information, managing the data object in the storage system according to the storage rule. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.

Abstract: The present application provides a method and apparatus of operating a shingled magnetic recording device that comprises a random access zone in which data is randomly readable and writable and a sequential access zone in which data is only sequentially readable and writable, and the sequential access zone is logically split into a plurality of banks operated independent of each other and storing a mapping from logical block addresses to physical block addresses in the random access zone; storing, in each bank of the plurality of banks in the sequential access zone, a respective part of a mapping from physical block addresses to logical block addresses; and operating the shingled magnetic recording device based on the mapping from logical block addresses to physical block addresses and the mapping from physical block addresses to logical block addresses.

Abstract: Described are techniques for processing capacity-related event occurrence. A first occurrence is determined for of any of a low threshold event and an out of space event for a first storage pool. A set of one or more virtually provisioned logical devices has physical storage provisioned from the first storage pool and physical storage for a file system is provisioned from the set of one or more virtually provisioned logical devices. First processing is performed responsive to determining the first occurrence of any of the low threshold event and the out of space event for the first storage pool. The first processing includes performing processing to that protects the file system.

Abstract: Various embodiments of the present disclosure provide a method and an apparatus for reclaiming a chunk in a snapshot storage space. The method comprises: in response to a predefined trigger event, detecting an unused chunk in the snapshot storage space; and providing the detected unused chunk to a storage pool for reuse.

Abstract: Embodiments of the present disclosure relate to a method and apparatus for locking a file in a memory. The method comprises enabling a thread to obtain a mixed lock of a file. The method further comprises, in response to enabling the thread to obtain the mixed lock, enabling a further thread to obtain a shared lock of the file, and prevent the further thread from obtaining the exclusive lock or mixed lock of the file. By adding a new mixed lock to a traditional read and write lock, embodiments of the present disclosure improve concurrent access performance of the file system.