Patent ID: 11886294
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 9:
10. A method in a distributed storage system comprising:
a plurality of sites communicating via a network,
wherein each of the plurality of sites includes:
a plurality of nodes; and
storage devices for storing data,

the method comprising the steps of:
receiving, by a first node of a first site of the plurality of sites, user data together with a write request from a host and storing the received user data in the storage devices of the first site; and
transmitting, by the first node, data for redundant data of the user data to a second site of the plurality of sites,
receiving, by a second node of the second site, the data for redundant data from the first node and storing the redundant data in the storage devices at the second site, and
receiving, by the first node, a read request for the user data from the host, reading the user data from the storage devices of the first site and transmitting the user data to the host.