摘要:
Techniques for managing caching use of a solid state device are disclosed. In some embodiments, the techniques may be realized as a method for managing caching use of a solid state device. Management of the caching use may include receiving, at a host device, notification of failure of a solid state device. In response to the notification a cache mode may be set to uncached. In uncached mode input/output (I/O) requests may be directed to uncached storage (e.g., disk).
摘要:
A flash storage device includes a first memory, a flash memory comprising a plurality of physical blocks, each of the plurality of physical blocks comprising a plurality of physical pages, and a controller. The controller is configured to store, in the first memory, copies of data read from the flash memory, map a logical address in a read request received from a host system to a virtual unit address and a virtual page address, and check a virtual unit cache tag table stored in the first memory based on the virtual unit address. If a hit is found in the virtual unit cache tag table, a virtual page cache tag sub-table stored in the first memory is checked based on the virtual page address, wherein the virtual page cache tag sub-table is associated with the virtual unit address. If a hit is found in the virtual page cache tag sub-table, data stored in the first memory mapped to the hit in the virtual page cache tag sub-table is read in response to the read request received from the host system.
摘要:
A method and system for storing data in a multi-level cell (MLC) flash memory device are described. The method includes receiving data for storage in the flash memory device, the flash memory device comprising an array of MLC flash memory cells, and encoding the received data into non-binary symbols according to a trellis-coded modulation scheme. The method further includes writing each of the non-binary symbols to a respective flash memory cell set, wherein each flash memory cell set comprises a plurality of MLC flash memory cells.
摘要:
A memory device includes: volatile memory; an interface for connecting to a backup power source; non-volatile memory; a first configuration data bus for accessing parameters describing substantially permanent characteristics of the volatile memory; a second configuration data bus for accessing at least one of state of health information of the backup power source and status information of the memory device, wherein the first configuration data bus and the second configuration data bus implement a same bus protocol; a controller programmed to detect a loss of power of a primary power source and move data from the volatile memory to the non-volatile memory, wherein configuration information of the controller is at least one of readable and writable through the first configuration data bus; and wherein at least one of the state-of-health information and the status information is at least one of readable and writable through the second configuration data bus.
摘要:
Techniques for managing cache configuration are disclosed. In some embodiments, the techniques may be realized as a method for managing creation of nodes names and references to source devices during detection of storage devices (e.g., a physical devices such as a SCSI Disk, a redundant array of independent disks (RAID), or logical devices such as logical volume management (LVM) volumes or automatic storage management (ASM) volumes). Management of cache configuration may include creation of rules to generate node names upon detection of source and/or cache devices. Management of cache configuration also may include the creation of rules to create caches or initiate creation of caches upon successful creation of source devices and cache devices corresponding to a cache. Management of cache configuration may include management of the creation of symbolic links to a cache of a source device.
摘要:
The subject disclosure describes a method for performing error code correction, the method includes, loading a code word including a plurality of encoded bits into a memory array, initializing, into one or more of a plurality of memory units, a plurality of bits associated with each of the encoded bits, wherein the plurality of bits initialized for each of the encoded bits is based on a value of the associated encoded bit and wherein the plurality of encoded bits and the plurality of bits initialized for each of the encoded bits includes soft information. In certain aspects, the method further includes decoding the code word using the soft information and outputting the decoded code word from the memory array. A decoder and flash storage device are also provided.
摘要:
Some embodiments of the disclosed subject matter include an integrated circuit. The integrated circuit includes a solid state device controller configured to control a plurality of flash memory devices, a first set of input output IO pads, coupled to the solid state device controller, arranged as a first pad ring around a perimeter of the integrated circuit, and a second set of IO pads arranged adjacent to at least one side of the first pad ring, wherein one of the second set of IO pads includes a power source node configured to receive a power supply voltage for the solid state device controller, a ground node, and a bond pad configured to receive an external signal.
摘要:
The subject disclosure describes a method for reducing a sector error rate in a flash memory device, the method comprising, identifying a first program verify level having a first value, selecting an adjustment value for the first program verify level and programming the adjustment value to the first program verify level to replace the first value and to shift a first programming distribution associated with the first program verify level, wherein the shift in the first programming distribution is associated with a decrease in a sector error rate, wherein the shift in the first programming distribution is associated with an increase in a bit error rate. A flash storage device and computer-readable media are also provided.
摘要:
Aspects of the subject technology encompass a method for retrieving information stored in flash memory. In certain implementations, the method can include operations for reading a plurality of memory cells in a word line, generating a plurality of read signals based on the reading of the plurality of memory cells and identifying, from among the plurality of read signals, a first read signal associated with a first memory cell and a second read signal associated with a second memory cell, wherein the first memory cell is adjacent to the second memory cell in the word line. In certain aspects, the method can further include operations for generating an output for the first memory cell, wherein the output is based on the first and second read signals. A data storage system and article of manufacture are also provided.
摘要:
A secure storage device includes a storage medium configured to securely store data received from a host. The storage device further includes a host interface configured to transfer data between the host and the storage device and an encryption engine. The encryption engine is configured to encrypt data received from a host using a key and provide the encrypted data to the storage medium for storage. The encryption engine is further configured to decrypt encrypted data received from the storage medium and provide the data to the host via the host interface. In response to a predetermined condition, the storage device is configured to disable the encryption engine thereby preventing the encrypted data stored thereon from being decrypted.