US 11,989,455 B2
Storage system, path management method, and recording medium
Shinri Inoue, Tokyo (JP); Kouji Iwamitsu, Tokyo (JP); and Takao Totsuka, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on May 24, 2022, as Appl. No. 17/752,156.
Application 17/752,156 is a continuation of application No. 16/820,899, filed on Mar. 17, 2020, granted, now 11,372,584.
Claims priority of application No. 2019-176446 (JP), filed on Sep. 27, 2019.
Prior Publication US 2022/0283745 A1, Sep. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/06 (2006.01)
CPC G06F 3/0659 (2013.01) [G06F 3/0611 (2013.01); G06F 3/0653 (2013.01); G06F 3/0673 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A storage system, comprising:
a plurality of storage nodes,
wherein each of the storage nodes provides a logical unit as a storage area for storing data to a higher-level apparatus,
wherein each of the storage nodes is configured to:
select a priority path to be notified as a usable path to a higher-level apparatus among paths which allow access to a predetermined logical unit, and
send information about the selected priority path as a reply to an inquiry from the higher-level apparatus about a path to the predetermined logical unit,
wherein each of the paths is accessible to the logical unit via the storage nodes that are different from each other,
wherein each of the storage nodes is further configured to:
select the priority path for the new logical unit when the new logical unit is created, and
transmit the information of the selected priority path to each of the storage nodes via the selected priority path, and
wherein each storage node that receives the information of the selected priority path updates the information of its own priority path based on the selected priority path.