Recovery of in-memory state in log-structured filesystem using fuzzy checkpoints
Tintri by DDN, Inc. has been assigned a patent for a “recovery of in-memory state in a log-structured filesystem using fuzzy checkpoints.

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Recovery of an in-memory state in a log-structured filesystem using fuzzy checkpoints is disclosed, including: determining a portion of a data structure to checkpoint to a storage unit, wherein the structure is associated with a set of references to locations in persistent storage at which metadata is stored, wherein the portion of the data structure is dynamically determined based at least in part on a size of the data structure and a predetermined number of storage units to be associated with a checkpoint window, wherein the number of storage units to be associated with the checkpoint window is fewer than a total number of storage units associated with the persistent storage, and checkpointing the portion of the data structure to the storage unit.”

Efficient deduplication for storage
Tintri by DDN, Inc. has been assigned a patent for an “efficient deduplication for storage systems.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Efficient deduplication for storage systems is disclosed, including: using the current data structure to track a set of deduplication data entries associated with a collection group, determining a flush criterion has been met, and storing the set of deduplication data entries of the current data structure as one or more persistent objects associated with the collection group in a persistent storage, wherein the one or more persistent objects are usable to update a set of persistently stored metadata associated with the collection group that tracks deduplication data entries generated before a previous merge operation.”

Cluster virtual machines
Tintri by DDN, Inc. has been assigned a patent for a “cluster virtual machines.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Aggregating data associated with cluster virtual machines is disclosed, including obtaining from a plurality of storage systems a plurality of values associated with an attribute associated with a cluster virtual machine (VM) and aggregating the plurality of values associated with the attribute based at least in part on an aggregation semantic associated with the attribute.”

Policy-driven RAID rebuild
Tintri by DDN, Inc. has been assigned a patent for a “policy-driven RAID rebuild.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A system for policy-driven RAID rebuild includes an interface to a group of devices each having stripe units. At least one of the devices is a spare device available to be used in the event of a failure of a device in the group of devices. The system further includes a processor coupled to the interface and configured to determine, based at least in part on an ordering criteria, an order in which to reconstruct stripe units to rebuild a failed device in the group of devices. The processor is further configured to rebuild the failed device including by reconstructing stripe units in the determined order using the spare device to overwrite stripe units as needed.”

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