Emc IP Holding Company LLC

Joe Jian Liu

Chen Gong

Lester Zhang

Denny Dengyu Wang

Junping Zhao

Walter Wang

Geng Han

Huan Chen

Chao Han

Leon Zhang

Embodiments of the present disclosure provide a method, and apparatus and a computer readable medium for controlling a storage system. For example, a method for controlling a storage system is provided. The method comprises: determining a control factor related to a background operation in the storage system, the control factor including a usage state of a storage resource pool in the storage system; setting a priority level for the background operation based on the determined control factor; and controlling execution of the background operation based on the set priority level. Embodiments of the present disclosure may accelerate execution of background operations, improve resource utilization efficiency, and ensure good I/O performance.

Method, apparatus and computer storage medium for controlling a storage system

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.

Method and apparatus for reclaiming memory blocks in snapshot storage space

Embodiments of the present disclosure generally relate to a method and device for managing caches. In particular, the method may include in response to receiving a request to write data to the cache, determining the amount of data to be written. The method may further include in response to the amount of the data exceeding a threshold amount, skipping writing data to the cache and writing the data to a lower level storage of the cache. Corresponding systems, apparatus and computer program products are also provided.

Method and device for managing caches

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.

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Beijing, China

Joe Jian Liu