US 2024/0192886 A1 · SEGREGATING LARGE DATA BLOCKS FOR DATA STORAGE SYSTEM

Abstract

Methods and apparatus for efficiently handling large data files and their updates in NAND memory. In one example, provided is a data-storage system configured to reduce the frequency of data relocations by segregating a large data file into a plurality of subfiles. The size of such subfiles is appropriately selected to reduce the probability of occurrence for host-relocation conflicts and the magnitude of write amplification, thereby enabling the data-storage system to provide better quality of service while substantially maintaining acceptable levels of other pertinent performance characteristics. In some examples, a sequence of host read-modify-write commands is handled by generating a copy of implicated subfiles in a data buffer, applying subfile updates to the copy in the data buffer in accordance with the sequence, and relocating the implicated subfiles in the NAND memory using the updated versions thereof from the data buffer.

Claims20

Dependent claims

A data storage device, comprising:

a nonvolatile memory to store data;
a second memory to store a logical-to-physical (L2P) table and a subfile mapping table;
and
a controller coupled to the nonvolatile memory and the second memory and configured to:
in response to a host command to write a large data file to the nonvolatile memory, segregate the large data file into a plurality of subfiles, the large data file having a file size larger than a first fixed size, each subfile of the plurality of subfiles having a respective size smaller than or equal to the first fixed size;
store a first mapping of the plurality of subfiles in the subfile mapping table, the first mapping including, for each subfile of the plurality of subfiles, a respective word-line physical address;
cause the plurality of subfiles to be written to the nonvolatile memory based on the first mapping;
and
access the L2P table and the subfile mapping table to control a memory operation on the large data file in the nonvolatile memory.

6 more elements

A method performed by a data storage device, the method comprising:

in response to a host command to write a large data file to a nonvolatile memory, segregating, via a controller, the large data file into a plurality of subfiles, the large data file having a file size larger than a first fixed size, each subfile of the plurality of subfiles having a respective size smaller than or equal to the first fixed size;
storing, via the controller, a first mapping of the plurality of subfiles in a subfile mapping table, the first mapping including, for each subfile of the plurality of subfiles, a respective word-line physical address;
causing, via the controller, the plurality of subfiles to be written to the nonvolatile memory based on the first mapping;
and
accessing, via the controller, a logical-to-physical (L2P) table and the subfile mapping table to control a memory operation on the large data file in the nonvolatile memory.

2 more elements

Dependencies are inferred from the claim text.

Segregating large data blocks for data storage system

Life of this patent

Segregating large data blocks for data storage system

Life of this patent

Abstract

Claims20