# US 12,222,957 B2 · Storage system and data backup processing method in storage system

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- Number: US 12,222,957 B2
- Document ID: US12222957B2
- Status: Granted
- Kind: B2
- Application number: 18/243,916
- Filed: 2023-09-08
- Published: 2024-10-24
- Granted: 2025-02-11
- Earliest claimed: 2023-04-19
- Assignees: Hitachi Vantara, Ltd.
- Applicants: Hitachi, Ltd.
- Inventors: Kazuei Hironaka; Masahiro Arai; Akira Deguchi
- Web page: https://patentgrep.com/patent/US12222957B2

## CPC

- G06F 16/27: Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
- G06F 11/1464: {for networked environments}
- G06F 2201/84: Using snapshots, i.e. a logical point-in-time copy of the data
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

To back up stored data of a storage device installed on-premise to a storage service provided by a public cloud more reliably and efficiently. A storage system according to the invention includes a storage device having first storage logical volumes (LDEVs), and a storage device having second storage LDEVs. When stored data of a first LDEV and stored data of a second LDEV are synchronized with each other, network conditions in a transfer path from the storage device to the public cloud and in a transfer path from the storage device to the public cloud are observed. The first LDEV or the second LDEV is selected as a backup source based on the network conditions.

## Claims

### Claim 1

A storage system comprising:
a first storage device having a first logical volume;
a second storage device having a second logical volume forming a remote replication pair with the first logical volume; and
an integrated management device configured to manage the first storage device and the second storage device, wherein
stored data of the first logical volume or stored data of the second logical volume is backed up to a storage service provided by a public cloud, and
when stored data of the first logical volume and stored data of the second logical volume are synchronized, the integrated management device or the first storage device selects, based on network conditions in a transfer path from the first storage device to the public cloud and in a transfer path from the second storage device to the public cloud, the first logical volume or the second logical volume as a backup source.

### Claim 2 (depends on 1)

The storage system according to claim 1, wherein
the integrated management device selects, based on transfer costs in the transfer path from the first storage device to the public cloud and in the transfer path from the second storage device to the public cloud, the first logical volume or the second logical volume as the backup source.

### Claim 3 (depends on 2)

The storage system according to claim 2, wherein
the second storage device is installed on a cloud connected to the same network as the public cloud.

### Claim 4

A data backup processing method in a storage system,
the storage system including
a first storage device having a first logical volume, and
a second storage device having a second logical volume forming a remote replication pair with the first logical volume,
the data backup processing method being used for backing up stored data of the first logical volume or stored data of the second logical volume to a storage service provided by a public cloud and comprising:
observing network conditions in a transfer path from the first storage device to the public cloud and in a transfer path from the second storage device to the public cloud when stored data of the first logical volume and stored data of the second logical volume are synchronized; and
selecting the first logical volume or the second logical volume as a backup source based on the network conditions.