Seagate Technology Incorporated

Other

Graham David Ferris

Ryan James Goss

Daniel John Benjamin

Ryan Charles Weidemann

David W Claude

Method and apparatus for enhancing performance of a storage device, such as a solid-state drive (SSD). In some embodiments, the storage device monitors a rate at which client I/O access commands are received from a client to transfer data with a non-volatile memory (NVM) of the storage device. A ratio of background access commands to the client I/O access commands is adjusted to maintain completion rates of the client I/O access commands at a predetermined level. The background access commands transfer data internally with the NVM to prepare the storage device to service the client I/O access commands, and can include internal reads and writes to carry out garbage collection and metadata map updates. The ratio may be adjusted by identifying a workload type subjected to the storage device by the client.

Client input/output (I/O) access rate variation compensation

Apparatus and method for managing metadata in a data storage device such as a solid-state drive (SSD). The metadata are stored in combined (combo) pages in a non-volatile memory (NVM) each having first and second level map entries. The second level map entries provide a logical-to-physical address translation layer for user data blocks stored to the NVM, and the first level map entries describe the second level map entries in the combo page. A global map structure is accessed to identify a selected combo page in the NVM associated with a pending access command. The first and second level map entries are retrieved from the combo page, and the second level map entries are used to identify a target location for the transfer of user data blocks to or from the NVM.

Combined page footer for parallel metadata storage

Apparatus and method for object storage, such as a solid-state drive (SSD) or array thereof. In some embodiments, data arranged as an object are presented for storage to a non-volatile memory (NVM) of a data storage device. Prior to storage, a configuration of the NVM is adaptively adjusted, such as by adjusting a garbage collection unit (GCU) layout, an error correction code (ECC) scheme, and/or a map metadata format used by the NVM. The object is thereafter stored to the NVM using the adaptively adjusted configuration. A controller of the data storage device generates a predicted remaining storage capacity of the NVM in terms of additional objects that can be stored by the NVM responsive to the adaptively adjusted configuration of the NVM. A non-linear sliding scale may be used such that a greater number of smaller objects or a smaller number of larger objects may be accommodated.

Data storage device with adaptive object storage capabilities

A data storage system can transfer user-generated data from a data storage device to a host responsive to a host workload that consists of data read requests from the host received at a requested rate. A completion rate of a data read request can be delayed in accordance to a data access uniformity strategy to nominally match the requested rate.

Data storage system with access completion uniformity

Method and apparatus for managing data in a storage device, such as a solid-state drive (SSD). In some embodiments, a first read command from a command queue is forwarded to a non-volatile memory (NVM) to request retrieval of a first set of readback data. While the NVM initiates in-process execution of the first read command, an expanded read command is issued to the NVM. The expanded read command supercedes the first read command and requests an expanded set of readback data that includes the first set of readback data as well as a second set of readback data. The second set of readback data may be associated with a second read command in the command queue. The NVM transfers the expanded set of readback data to a read buffer responsive to the expanded read command. The first and second read commands may be client reads, background reads or both.

Combining in-process reads to reduce die collisions

A system may consist of a network controller connected between a non-volatile memory and a host with a disturb module connected to the non-volatile memory. A received data write request from a host may prompt the assignment of a first physical block address in the non-volatile memory to a data block of the data write request with the network controller. The data block and first physical block address can each be characterized with the disturb module before the first physical block address is altered to a second block address in the non-volatile memory in response to a disturb strategy generated by the disturb module. The second block address can be selected based on the characterization of the data block and first physical block address with respect to a risk of a disturb condition occurring in the non-volatile memory.

Data storage system with read disturb control strategy whereby disturb condition can be predicted

Method and apparatus for enhancing power cycle performance of a storage device, such as a solid-state drive (SSD). In some embodiments, map data that describe the contents of a non-volatile memory (NVM) are arranged as snapshots and intervening journal updates. During a scram interval in which the storage device transitions to a powered down condition, the snapshots and journal updates for primary segments with high client interest are updated prior to storage to the NVM. During a reinitialization interval in which the storage device transitions to a powered up condition, the updated primary segments are loaded, after which the storage device provides the client device with an operationally ready notification. Remaining secondary segments are updated and loaded after the notification. The primary segments are identified based on a detected workload from the client device. Configuration changes can further be made based on the detected workload.

Storage device with enhanced time to ready performance

Method and apparatus for managing data in a storage device, such as a solid-state drive (SSD). In some embodiments, write and read commands from a client device are placed into a command queue pending servicing to transfer data between the client device and a non-volatile memory (NVM). A write cache temporarily stores sets of writeback data pending transfer. A cache manager detects an overlap condition in which a subsequently received command at least partially overlaps a pending write command. In response, the cache manager enacts a change in caching policy that includes retention of the cached writeback data to aid in the servicing of the subsequently received command. The changes in caching policy can include an increase in the size of the write cache, delays in the writing of hot writeback data sets, the coalescing of different writeback data sets, cache hits using the cached writeback data, etc.

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Savage, MN, United States of America

Graham David Ferris