Western Digital Technologies, Inc.

Hgst Netherlands, B.v.

Phillip Peterson

Sanjay Subbarao

Colin Christopher McCambridge

David George Dreyer

Darin Edward Gerhart

Cory Lappi

William Jared Walker

Timothy Glen Hallett

Anton John Neu

A method of indirection replay for a flash storage system includes writing data, in a host stream, to blocksets of the flash storage system. The host blocksets are assigned a major sequence number incremented from the most recently closed host blockset. The method includes writing an indirection journal to each host blockset which are associated with the assigned major sequence number. The method includes writing data, in a garbage collection (GC) stream, to other blocksets of the flash storage system. The GC blocksets are assigned a major sequence number, based on the most recently closed host blockset, and a minor sequence number, incremented from the most recently closed GC blockset. The method includes writing an indirection journal to each GC blockset which are associated with the assigned major and minor sequence numbers. The indirection table is constructed by replaying the journals of the blocksets in order of major sequence and minor sequence numbers.

Multi-stream journaled replay

Techniques are described for managing firmware versions for a storage device. In one example, a storage device includes a memory and a controller. The controller is configured to execute a first version of a firmware, receive information for a second version of a firmware that is different from the first version, determine, based on the information for the second version of the firmware, whether the version of the second version of the firmware is stored in a system area of the memory, responsive to determining that the second version of the firmware is stored in the system area, load the second version of the firmware, responsive to determining that the second version of the firmware is not stored in the system area, store the second version of the firmware in the system area, update an active firmware index, and execute the second version of the firmware.

Managing wear of system areas of storage devices

Systems and methods for internally preconditioning SSDs for various workloads are disclosed. One such method involves (1) receiving preconditioning parameters including an invalidity distribution across ribbons, a transfer size of workloads, and a randomness of workloads, (2) generating workload data including a percentage of random data and a percentage of non-random data, where the percentages are based on the randomness of workloads parameter, (3) determining preselected physical block addresses (PBAs) of a ribbon using the invalidity distribution parameter, (4) writing a portion of the workload data to each of the preselected PBAs of the ribbon using a preselected transfer size until the ribbon is full, where the transfer size is based on the transfer size of workloads parameter, (5) marking all PBAs of the ribbon that were not preselected using the invalidity distribution parameter as being invalid, and (6) repeating (2) to (5) until a preselected end condition is met.

Internally preconditioning solid state drives for various workloads

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Rochester, MN, United States of America

Phillip Peterson