Reducing required battery capacity for data backup in a storage system with multiple controllers

Patent metadata

Field	Value
Publication number	US-9201601-B2
Application number	US-201314234017-A
Country	US
Kind code	B2
Filing date	May 30, 2013
Priority date	May 30, 2013
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

A storage system which is connected to a host computer, includes a storage device; a first controller which controls data transfers between the storage device and the host computer; a second controller connected to the first controller and controls data transfers between the storage device and the host computer; a non-volatile memory; and a battery device. The first controller includes a first volatile memory and the second controller comprising a second volatile memory. Upon a power outage, the battery device starts supplying electric power to the first controller and the second controller, and wherein the second controller copies data which is stored in the first volatile memory to the second volatile memory and, after copying is complete, stops operation of the first controller, stops the power supply from the battery device to the first controller, and copies data.

First claim

The invention claimed is:

1. A storage system which is connected to a host computer, comprising:
a storage device;
a first controller which comprises a first volatile memory and which controls data transfers between the storage device and the host computer;
a second controller which is connected to the first controller and which comprises a second volatile memory and controls, together with the first controller, the data transfers between the storage device and the host comput…

Assignees

• Hitachi Ltd

Inventors

• Matsubara Ryosuke
• Kanai Hiroki
• Maeda Toru

Classifications

• G06F12/0868 Primary

  Physics · mapped topic

• G06F3/0619 Primary

  Physics · mapped topic

• G06F2003/0691

  Physics · mapped topic

• G06F3/065

  Physics · mapped topic

• G06F12/0238

  Physics · mapped topic