Western Digital Technologies, Inc.

Hgst Netherlands, B.v.

Paul Dunn

Randall L Hess

To provide enhanced operation of data storage devices and systems, various systems, apparatuses, methods, and software are provided herein. In a first example, a data storage system is presented. The data storage system includes data storage devices comprising media for storage and retrieval of data. The data storage system includes a host interface configured to receive service level selections indicated by a host system for service level control of the one or more data storage devices. The data storage system includes a storage control system configured to operate the one or more data storage devices according to the service level selections.

Service level based control of storage systems

The present disclosure relates to systems and methods of an optimized data layout in an erasure coded storage system. The system may be realized as a deterministic layout of storage devices in an erasure coded storage system. The system implements a method for writing pieces of a data object across storage devices of a specified write set included an erasure coded storage subsystem. The system further implements a method for reading a subset of pieces of a data object from an active read subset of storage devices in a read set included in the erasure coded storage subsystem and restoring the data object from the subset of pieces. The system may further include operating an inactive read subset of storage devices in a read set in a low power mode.

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Colorado Springs, CO, United States of America

Paul Dunn