Proactive data placement in high density storage by a hybrid non-volatile storage controller

• Main Authors: Papandreou, Nikolaos, Pletka, Roman Alexander, Fisher, Timothy J, Walls, Andrew D, Fry, Aaron Daniel, Pozidis, Charalampos, Stoica, Radu Ioan, Ioannou, Nikolas
• Format: Patent
• Language: English
• Published: 17.09.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

A non-volatile memory includes physical blocks each including a respective plurality of cells, where each cell is capable of storing multiple bits of data. A controller maintains dynamically resizable pools of physical blocks, including at least a low-density pool in which cells are configured to store fewer bits and a high-density pool in which cells are configured to store more bits. The controller determines whe ther total utilization of physical blocks is less than a low-density pool utilization threshold above which the high-density pool of physical blocks is utilized for storing host write data and additionally identifies cold in-use logical block address (LBA) regions having low total access frequencies. Based on determining the total utilization of physical blocks is less than the low-density pool utilization threshold, the controller performs data placement of data from the cold in-use LBA regions in blocks of the high-density pool.