Abstract: Embodiments are directed to managing data in a file system. In response to a request from a client of a spoke file system to access file system items shared by a hub file system: determining a portion of the spoke file systems that may have an existing lock on the file system items; obtaining log entries from the portion of the spoke file systems such that the log entries are associated with commands that were executed in the portion of the spoke file systems; executing the commands in the hub file system to update the file system items in the hub file system; granting a lock on the file system items in the hub file system that enables the client to access the updated file system items from the spoke file systems.

Abstract: Embodiments are directed to managing data in a file system. In response to a request from a client of a spoke file system to access file system items shared by a hub file system: determining a portion of the spoke file systems that may have an existing lock on the file system items; obtaining log entries from the portion of the spoke file systems such that the log entries are associated with commands that were executed in the portion of the spoke file systems; executing the commands in the hub file system to update the file system items in the hub file system; granting a lock on the file system items in the hub file system that enables the client to access the updated file system items from the spoke file systems.

Abstract: Embodiments are directed to managing data in a file system. A file system that includes a file storage tier and a cache storage tier may be provided. An amount of hot blocks present in the cache storage tier that are associated with a heat score that matches a maximum heat score value may be determined. In response to the amount of hot blocks exceeding an amount threshold value further actions may be performed, including: determining each cooldown block in the cache storage tier based on each heat score associated with each block in the cache storage tier; and decrementing the heat score associated with each cooldown block. In response to one or more blocks in the cache storage tier being read, the heat score associated with the one or more blocks being read may be set to the maximum heat score value.

Abstract: Embodiments are directed to managing data in a file system. A file system that includes a file storage tier and a cache storage tier may be provided. An amount of hot blocks present in the cache storage tier that are associated with a heat score that matches a maximum heat score value may be determined. In response to the amount of hot blocks exceeding an amount threshold value further actions may be performed, including: determining each cooldown block in the cache storage tier based on each heat score associated with each block in the cache storage tier; and decrementing the heat score associated with each cooldown block. In response to one or more blocks in the cache storage tier being read, the heat score associated with the one or more blocks being read may be set to the maximum heat score value.

Abstract: Embodiments are directed to a file system engine that provides a file system that includes a plurality of blocks on a file storage tier with portion of the blocks associated with a cache storage tier. A cache engine provides heat extents that include a heat score and a run length value such that the heat extents are represent activities associated with the blocks. Heat extents associated with file system activities are determined based on a position of the blocks that corresponds with the run length values of the heat extents and sectors on the file storage tier. Heat scores associated with the heat extents may be modified based on the activities and distribution models to conform the heat extents with the distribution models. Blocks associated with heat scores that are less than a threshold value provided by the distribution models may be disassociated from the cache storage tier.

Abstract: Embodiments are directed to a file system engine that provides a file system that includes a plurality of blocks on a file storage tier with portion of the blocks associated with a cache storage tier. A cache engine provides heat extents that include a heat score and a run length value such that the heat extents are represent activities associated with the blocks. Heat extents associated with file system activities are determined based on a position of the blocks that corresponds with the run length values of the heat extents and sectors on the file storage tier. Heat scores associated with the heat extents may be modified based on the activities and distribution models to conform the heat extents with the distribution models. Blocks associated with heat scores that are less than a threshold value provided by the distribution models may be disassociated from the cache storage tier.

Abstract: Embodiments are directed to a file system engine that provides a file system that includes a plurality of blocks on a file storage tier with portion of the blocks associated with a cache storage tier. A cache engine provides heat extents that include a heat score and a run length value such that the heat extents are represent activities associated with the blocks. Heat extents associated with file system activities are determined based on a position of the blocks that corresponds with the run length values of the heat extents and sectors on the file storage tier. Heat scores associated with the heat extents may be modified based on the activities and distribution models to conform the heat extents with the distribution models. Blocks associated with heat scores that are less than a threshold value provided by the distribution models may be disassociated from the cache storage tier.