US 11,704,236 B2
Method and storage system with a layered caching policy
Ramanathan Muthiah, Bangalore (IN); Laxmi Bhoopali, Bangalore (IN); Vered Kelner, Moshav Gan Haim (IL); and Jonathan Journo, Shaarey Tikwa (IL)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Nov. 17, 2021, as Appl. No. 17/528,390.
Prior Publication US 2023/0153235 A1, May 18, 2023
Int. Cl. G06F 12/02 (2006.01); G06F 12/0882 (2016.01); G06F 12/0804 (2016.01)
CPC G06F 12/0246 (2013.01) [G06F 12/0292 (2013.01); G06F 12/0804 (2013.01); G06F 12/0882 (2013.01); G06F 2212/7201 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A storage system comprising:
a non-volatile memory;
a volatile memory;
an interface configured to communicate with a host comprising a host memory buffer; and
a controller configured to:
receive, from the host, a memory access command comprising a logical address;
read, from the non-volatile memory, a logical-to-physical address table that contains the logical address received from the host;
predict a likelihood that an update will be made to the logical-to-physical address table;
in response to the likelihood being above a threshold, store the logical-to-physical address table in the volatile memory and use the logical-to-physical address table: stored in the volatile memory to translate the logical address received from the host to a physical address in the non-volatile memory; and
in response to the likelihood not being above the threshold:
store the logical-to-physical address table in the host memory buffer and use the logical-to-physical address table stored in the host memory buffer to translate the logical address received from the host to the physical address in the non-volatile memory;
update the logical-to-physical address table after it has been stored in the host memory buffer;
receive the updated logical-to-physical address table from the host memory buffer;
store the updated logical-to-physical address table in the volatile memory; and
perform a consolidation process using the updated logical-to-physical address table.