Qumulo Assigned Two Patents

Space accounting for storage system snapshots
Qumulo, Inc., Seattle, WA, has been assigned a patent (10,552,373) developed by Brow, Edward, Wilson, Nicholas, Gebert, Robert, Urban, Thomas Scott, Krasnow, Michael Adam, and Haber, Steven, Seattle, WA, for a “space accounting for storage system snapshots.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A facility for snapshot space accounting for a storage system, such as a filesystem is disclosed. The facility enables users to quickly and easily determine the amount of storage space that would be released or recovered if a snapshot were to be purged. The facility may work in conjunction with, or as part of, a snapshot service. The facility maintains an expiration data structure and a count data structure and uses these data structures in implementing the disclosed snapshot space accounting techniques. The expiration data structure represents the life cycle of each snapshot element maintained by the facility while the count data structure represents, for pairs of snapshots, the size of the information stored in the snapshot data that expired and that spans the corresponding pair of snapshots.”

The patent application was filed on September 1, 2017 (15/694,604).

File system cache tiers
Qumulo, Inc., Seattle, WA, has been assigned a patent (10,534,758) developed by Carpenter, Edward, Rothschilds, Thomas Gregory,Godman, Peter J., Fairbanks, Duncan Robert, Jakubowski, Patrick, and Wang, Zexuan, Seattle, WA, for a “file system cache tiers.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”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.”

The patent application was filed on December 20, 2018 (16/228,716).