Western Digital Technologies, Inc.

Hgst Netherlands, B.v.

Randy Roberson

Randall L Hess

Jesse L Yandell

James Michael Reiser

Berck Nash

Kris B Stokes

Susan Gaye Elkington

Michael Walker

Michael Stillwell

Enhancements for managing quality of service in a multi-host Peripheral Component Interconnect Express (PCIe) switching environment involve a host system configured to maintain quality of service statistics corresponding to data interactions with a PCIe storage device available via a PCIe switch. The host system may further receive secondary quality of service statistics for one or more other host systems communicatively coupled to the PCIe device via the PCIe switch, and determine a maximum queue depth for the host system based on the quality of service statistics and the second quality of service statistics to maintain a quality of service for at least the host system.

Queue depth management for host systems accessing a peripheral component interconnect express (PCIe) device via a PCIe switch

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 device accumulates write data into a cache storage region prior to committing into an archive storage region and maintains a data structure that tracks the write data in the cache storage region. Responsive to receiving first write data into the cache storage region, the data storage device establishes first tracking elements in the data structure for the first write data in the cache storage region. Responsive to receiving second write data directed to storage locations overlapping the first write data, the data storage device accepts the second write data into the cache storage region and establishes second tracking elements in the data structure for the second write data in the cache storage region without modifying the first tracking elements.

Non-blocking caching for data storage drives

Described herein are enhancements for managing quality of service in a multi-host Peripheral Component Interconnect Express (PCIe) switching environment. In one implementation, a host system is configured to maintain quality of service statistics corresponding to data interactions with a PCIe storage device available via a PCIe switch. The host system may further receive secondary quality of service statistics for one or more other host systems communicatively coupled to the PCIe device via the PCIe switch, and determine a maximum queue depth for the host system based on the quality of service statistics and the second quality of service statistics to maintain a quality of service for the host systems.

A data storage array is presented that includes a plurality of storage drives each comprising storage media with a first storage region and a shingled magnetic recording (SMR) storage region. The data storage array includes a control system communicatively coupled to the storage drives and configured to receive a write operation over a host interface for storage of write data by the data storage array. Responsive to the write operation, the control system is configured to cache the write data in first storage regions of two or more of the storage drives prior to transfer of the write data into at least an SMR storage region of a storage drive associated with the write operation.

Enhanced redundant caching for shingled magnetic recording devices in data storage drive assemblies

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 device is presented with storage media comprising a cache storage region and a shingled magnetic recording (SMR) storage region that is divided into burst zones. A storage control system receives write operations and accumulates write data in the cache storage region until a commit threshold condition. Responsively, the storage control system transfers the write data into a burst zone of the SMR storage region, and verifies the write data written into the burst zone once the burst transfer is complete. Responsive to data verify errors in the write data written into the burst zone, the storage control system writes data associated with the data verify errors into an exception location associated with the burst zone.

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Lutz, FL, United States of America

Randy Roberson