Invention Grant
- Patent Title: Methods and apparatus for variable size logical page management based on hot and cold data
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Application No.: US15782829Application Date: 2017-10-12
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Publication No.: US10915475B2Publication Date: 2021-02-09
- Inventor: Rishabh Dubey , Saugata Das Purkayastha , Chaitanya Kavirayani , Sampath Raja Murthy , Nitin Gupta , Revanasiddaiah Prabhuswamy Mathada
- Applicant: Western Digital Technologies, Inc.
- Applicant Address: US CA San Jose
- Assignee: Western Digital Technologies, Inc.
- Current Assignee: Western Digital Technologies, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Loza & Loza, LLP
- Agent Gabriel Fitch
- Main IPC: G06F13/16
- IPC: G06F13/16 ; G06F12/02 ; G06F12/1009 ; G06F12/0882

Abstract:
Aspects of the disclosure provide for management of a flash translation layer (FTL) for a non-volatile memory (NVM) in a Solid State Drive (SSD). The methods and apparatus provide a logical to physical (L2P) table where a first portion of the table is used for mapping frequently accessed hot data to a first subdrive in the NVM. Additionally, a second portion of the L2P table is provided for mapping cold data less frequently accessed than the hot data to a second subdrive, where logical blocks for storing the cold data in the second subdrive are larger than logical blocks storing the hot data in the first subdrive. Separation of the L2P table into hot and cold subdrives reduces the L2P table size that is needed in RAM for logical to physical memory mapping, while at the same time provides lower write amplification and latencies, especially for large capacity SSDs.
Public/Granted literature
- US20190114272A1 METHODS AND APPARATUS FOR VARIABLE SIZE LOGICAL PAGE MANAGEMENT BASED ON HOT AND COLD DATA Public/Granted day:2019-04-18
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