US 11,989,412 B2
Storage system and method for minimizing node down time
Norio Chujo, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Mar. 22, 2022, as Appl. No. 17/701,000.
Claims priority of application No. 2021-103479 (JP), filed on Jun. 22, 2021.
Prior Publication US 2022/0404967 A1, Dec. 22, 2022
Int. Cl. G06F 3/06 (2006.01)
CPC G06F 3/0604 (2013.01) [G06F 3/0655 (2013.01); G06F 3/0679 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A storage system comprising:
a storage device;
a first node comprising of:
a first memory module that stores an operating system (OS) and a program for managing user data to be stored in the storage device,
a second memory module that stores cache data of the user data to be stored in the storage device, wherein the second memory module is replaceable without shutting down power supply of the first node, and
a first processor communicatively coupled to the first memory module and the second memory module;
a secondary node comprising a third memory module;
wherein the first processor is configured to:
store a copy of data to be stored in the second memory module in the third memory module, and
when the user data is accessed from the first node and the second memory module has a failure, disable the second memory module and process the user data using the copy of the data stored in the third memory module.