US 2014/0208023 A1 · STORAGE SYSTEM AND CONTROL METHOD FOR STORAGE SYSTEM

Abstract

An exemplary storage system of the invention processes requests to access a primary volume and a plurality of secondary volumes forming pairs with the primary volume. In each of the plurality of secondary volumes, address areas are defined which are respectively associated with address areas of the primary volume. Each of the plurality of secondary volumes stores differential data with respect to data in the primary volume. A controller monitors write accesses to the primary volume and the plurality of secondary volumes, and retains a monitoring result. The controller controls, based on, in the monitoring result, presence/absence of past write accesses to a plurality of areas in the primary volume and areas respectively corresponding to the plurality of areas in the plurality of secondary volumes, accesses to the primary volume.

Claims13

Dependent claims

A storage system, comprising:

an interface for transmitting/receiving data to/from a plurality of hosts;
and
a controller for processing requests to access a primary volume and a plurality of secondary volumes forming pairs with the primary volume via the interface, wherein:
in each of the plurality of secondary volumes, address areas are defined which are respectively associated with address areas of the primary volume;
each of the plurality of secondary volumes stores differential data with respect to data in the primary volume;
the controller monitors write accesses to the primary volume and the plurality of secondary volumes, and retains a monitoring result;
and
the controller controls, based on, in the monitoring result, presence/absence of past write accesses to a plurality of areas in the primary volume and areas respectively corresponding to the plurality of areas in the plurality of secondary volumes, accesses to the primary volume.

5 more elements

A control method for a storage system for processing a request to access a primary volume and a plurality of secondary volumes forming pairs to the primary volume,

the plurality of secondary volumes each having address areas defined therein, which are respectively associated with address areas of the primary volume,
the plurality of secondary volumes each storing differential data with respect to data in the primary volume,
the control method comprising:
monitoring write accesses to the primary volume and the plurality of secondary volumes, and retaining a monitoring result;
and
controlling, based on, in the monitoring result, presence/absence of past write accesses to a plurality of areas in the primary volume and areas respectively corresponding to the plurality of areas in the plurality of secondary volumes, accesses to the primary volume.

3 more elements

Dependencies are inferred from the claim text.

Storage system and control method for storage system

Life of this patent

Storage system and control method for storage system

Life of this patent

Abstract

Claims13