Hgst, Inc.

Intelliflash by Ddn, Inc.

Enyew Tan

Shailendra Tripathi

Daniel P McGregor

A method, system and computer program product for managing an amount of storage written from a transaction group comprises creating a plurality of transaction classes within each of a plurality of write transaction classes and discovering an initial underlying drive capability assignable to the transaction classes when a storage pool is allocated (SPA). Each transaction class capability weight is adjusted via computing an instruction and operations per second, a data rate per second and a time slice at every storage pool allocator sync time. An unspent time slice from an adjusted transaction class is lent to a plurality of remaining transaction classes yet to be adjusted via a staged processing distribution during sync of the SPA. The disclosed method further includes assigning system resources and underlying drive capability to each transaction class per its capability weight based on a ratio of weights for each transaction class of operations.

Predictable client latency via background file system operations

A method, system and a computer program product for managing file system memory includes a module configured to implement a separate replacement policy and a separate index for a persistent second level adaptive replacement cache (L2ARC) logically part of a first level ARC. The system also includes a module configured to cluster compressed chunks of data on multiple physical devices via aligning the clusters of data chunks on a byte boundary basis on each of the devices. The method additionally includes a module configured to create a storage pool allocator (SPA) to track the compressed and packed chunks on the multiple devices via an attached active page and attached multiple closed pages. The method further includes re-adding an evicted data from the L2ARC to an active page to be written again thereto based on a configurable threshold number of hits to data in the L2ARC via an L2ARC hit counter.

Growing community of inventors

Newark, CA, United States of America

Enyew Tan