Micron Technology Incorporated

Alex Frolikov

Chandra Mouli Guda

Joe Gil Mendes

Zachary Andrew Pete Vogel

A memory system having non-volatile media and a controller configured to process requests from a host system to store data in the non-volatile media or retrieve data from the non-volatile media. The non-volatile media has a set of memory units. The memory system stores an indicator indicating whether the memory system is operating in a user mode or a manufacturing mode. A defect manager of the memory system identifies a threshold based on the indicator, monitors an error rate in reading data from the non-volatile media and, in response to the error rate reaching the threshold, screens the non-volatile media for defective memory units.

Defective memory unit screening in a memory system

A memory system having a set of media, a set of resources, and a controller configured via firmware to use the set of resources in processing requests from a host system to store data in the media or retrieve data from the media. The memory system has a workload manager that analyzes activity records in an execution log for a time period where each of the activity records can indicate whether a processor of the controller is in an idle state during a time slot in the time period. The workload manager identifies idle time slots within the time period during which time slots one or more lightly-loaded processors in the plurality of processors are in the idle state, and adjusts a configuration of the controller to direct tasks from one or more heavily-loaded processors to the one or more lightly-loaded processors.

Determination of workload distribution across processors in a memory system

A computer storage device having a host interface, a controller, non-volatile storage media, and firmware. The firmware instructs the controller to: store a namespace map mapping blocks of logical block addresses in a namespace to blocks from a logical address capacity of the non-volatile storage media; adjust the namespace map to change the size of the namespace; and translate logical addresses in the namespace to physical addresses for the non-volatile storage media using the namespace map.

Namespace size adjustment in non-volatile memory devices

A computer storage device having a host interface, a controller, non-volatile storage media, and firmware. The firmware instructs the controller to: generate mapping data defining mapping, from logical block addresses in namespaces configured on the non-volatile storage media, to logical block addresses in a capacity of the non-volatile storage media; maintain an active copy of the mapping data; generate cached copies of the mapping data from the active copy; generate a shadow copy from the active copy; implement changes in the shadow copy; after the changes are made in the shadow copy, activate the shadow copy and simultaneously deactivate the previously active copy; and update the cached copies according to the newly activated copy, as a response to the change in active copy identification.

Namespace change propagation in non-volatile memory devices

A computer system having a host coupled to a storage device via a peripheral component interconnect express bus. The host communicates write commands of low priority to the storage device, which places them in a queue for execution at an idle time. In response to a determination that the storage device is in an idle state, the storage device best accommodates the write commands in the idle queue in connection with housekeeping tasks, such as garbage collection and wear leveling, to best reduce write amplification.

Latency-based scheduling of command processing in data storage devices

A memory system having a mode indicator, a set of hardware resources, a set of media, and a controller. When the mode indicator identifies a factory mode, a first portion of the hardware resources is reserved for performance of factory functions by the controller and a second portion of the hardware resources is allocated for performance of normal functions. When the mode indicator identifies a user mode, both the first portion and the second portion are allocated for the performance of the normal function. The normal functions are performed by the controller to at least store data in and retrieve data from the set of media in response to requests from a host system.

Resource allocation in memory systems based on operation modes

A memory system having a set of non-volatile media, a volatile memory, a buffer memory, and a controller configured to process requests from a host system to store data in the non-volatile media or retrieve data from the non-volatile media. The buffer memory is capable of holding data for at least a predetermined period of time after the volatile memory loses data during an event of power outage in the memory system. A power manager monitors a power supply of the memory system to detect an onset of power outage and, in response to the onset of power outage, causes the controller to copy meta data in the volatile memory to the buffer memory.

Meta data protection against unexpected power loss in a memory system

A computer storage device having a host interface, a controller, non-volatile storage media, and firmware. The firmware instructs the controller to: store a namespace map to map blocks of logical addresses defined in a namespace to first blocks of logical addresses defined in a capacity of the non-volatile storage media; without changing a size of the namespace, adjust the namespace map to map the blocks of the logical addresses defined in the namespace to second blocks of the logical addresses defined in the capacity of the non-volatile storage media (e.g., to consolidate blocks for performance improvement); and translate the logical addresses in the namespace to physical addresses for the non-volatile storage media using the namespace map.

Namespace mapping optimization in non-volatile memory devices

A computer storage device having a host interface, a controller, non-volatile storage media, and firmware. The firmware instructs the controller to: allocate a named portion of the non-volatile storage device; generate, according to a first block size, first block-wise mapping data; translate, using the first block-wise mapping data, logical addresses defined in the named portion to logical addresses defined for the entire non-volatile storage media, which can then be further translated to physical addresses in a same way for all named portions; determine a second block size; generate, according to the second block size, second block-wise mapping data; translate, using the second block-wise mapping data, the logical addresses defined in the named portion to the logical addresses defined for the entire non-volatile storage media.

Namespace mapping structural adjustment in non-volatile memory devices

A memory system having non-volatile media, a volatile memory, and a controller configured to process requests from a host system to store data in the non-volatile media or retrieve data from the non-volatile media. The non-volatile media has a quantity of memory units and stores an address map that defines logical addresses used in the requests in terms of physical addresses of the memory units in the non-volatile media. The host system has a memory connected to the memory system via a communication channel. The memory system has a cache manager that stores a first portion of the address map in the volatile memory of the memory system and a second portion of the address map in the memory of the host system. In response to an operation that uses a logical address defined in the second portion, the cache manager retrieves the second portion of the address map from the memory of the host system through the communication channel to the volatile memory of the memory system.

Address map caching for a memory system

A computer having a plurality of accounts and a storage device having a host interface, a controller, non-volatile storage media, and firmware. An account is configured with at least a predetermined speed in accessing the non-volatile storage media by allocating a number of input/output submission queues in the buffer area of the host. The number can be determined from a ratio between the predetermined speed configured for the account and a saturated speed of the storage device with sufficient submission queues. Data access requests from the account are evenly distributed to the submission queues allocated for the exclusive use by the account; and the controller, configured via the firmware, processes with equal priority the submission queues configured for the storage device. Thus, the account can have at least the predetermined speed in accessing the non-volatile storage media, regardless of how other accounts access the storage device.

Performance allocation among users for accessing non-volatile memory devices

A computer system having a host in communication with a data storage device is coupled to the host via a peripheral bus and a host interface. The data storage device has a controller, non-volatile storage media; and firmware containing instructions configures the operations of the controller. The host transmits a sequence of commands to the storage device to read data items from, or write data items to, the non-volatile storage media. The storage device examines a subset of the commands to determine whether or not data items identified in the subset are addressed sequentially and optimizes processing of at least a portion of the sequence of commands based on a result of a determination of whether or not data items identified in the subset are addressed sequentially.

Data stream identification and processing in data storage device

A computer system having a host coupled to a storage device via a peripheral component interconnect express bus. The host communicates with the storage device in accordance with a non-volatile memory host controller interface specification. The host provides a customized module containing instructions for performing the operations of a customized command. The host sends an idle time command to the storage device for execution at an idle time. In response to a determination that the storage device is in an idle state, the storage device executes the idle time command, during which the module may be used by the controller of the storage device.

Data storage device idle time processing

A data storage system having non-volatile media, a buffer memory, a processing device, and a data pre-fetcher. The data pre-fetcher receives commands to be executed in the data storage system, provides the commands as input to a predictive model, obtains at least one command identified for pre-fetching, as output from the predictive model having the commands as input. Prior to the command being executed in the data storage device, the data pre-fetcher retrieves, from the non-volatile memory, at least a portion of data to be used in execution of the command; and stores the portion of data in the buffer memory. The retrieving and storing the portion of the data can be performed concurrently with the execution of many commands before the execution of the command, to reduce the latency impact of the command on other commands that are executed concurrently with the execution of the command.

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Alex Frolikov