Western Digital Technologies, Inc.

Fittedcloud, Inc.

Hgst Netherlands, B.v.

Jin Ren

Prashant Parikh

Ken Qing Yang

Prakash Manden

Jienhua Huang

Gregory Evan Fedynyshyn

Qing K Yang

The present disclosure relates to systems, methods, and computer program products for keeping multiple caches updated, or coherent, on multiple servers when the multiple caches contain independent copies of cached data. Example methods may include receiving a request to write data to a block of a first cache associated with a first server in a clustered server environment. The methods may also include identifying a second cache storing a copy of the block, where the second cache is associated with a second server in the clustered environment. The methods may further include transmitting a request to update the second cache with the received write data, and upon receiving a subsequent request to write subsequent data, identifying a third cache for invalidating based on access patterns of the blocks, where the third cache is associated with a third server in the clustered environment.

Cache coherence protocol

A device or system includes a plurality of storage resources each associated with a respective performance class, each being associated with selected performance characteristics such as IOPS, bandwidth, etc. The device or system includes a compute instance having access to allocated storage resources, the allocated storage devices including one or more storage resources. The device or system also includes an optimization component adapted to obtain information relating to utilization by the compute instance component of the allocated storage resources, determine that a change to the allocated storage resources is necessary, based on the information, cause data to be migrated from a first storage resource associated with a first performance class to a second storage resource associated with a second storage class, and cause a removal from the allocated storage resources of the first storage resource and an addition to the allocated storage resources of the second storage resource.

Devices, systems, apparatus, and methods for transparent and automated optimization of storage resource allocation in a cloud services system

A data storage caching architecture supports using native local memory such as host-based RAM, and if available, Solid State Disk (SSD) memory for storing pre-cache delta-compression based delta, reference, and independent data by exploiting content locality, temporal locality, and spatial locality of data accesses to primary (e.g. disk-based) storage. The architecture makes excellent use of the physical properties of the different types of memory available (fast r/w RAM, low cost fast read SSD, etc) by applying algorithms to determine what types of data to store in each type of memory. Algorithms include similarity detection, delta compression, least popularly used cache management, conservative insertion and promotion cache replacement, and the like.

Pre-cache similarity-based delta compression for use in a data storage system

Systems and methods for cache coherence protocol

Growing community of inventors

Acton, MA, United States of America

Jin Ren