US 2006/0085611 A1 · Method of managing multistage copied data

Abstract

Provided is a computer system comprising a system management server, an application server coupled to the system management server, and a storage system coupled to the application server. The storage system comprises logical volumes which constitute a pair through data copying. The system management server comprises a data management unit which manages data stored in the logical volumes, and management information for managing the data stored in the logical volumes and the pair. Upon reception of a request for changing a pair status, the data management unit refers to the management information to determine data to be lost from the logical volume by performing the change, and outputs information regarding the data to be lost. Thus, it is possible to prevent occurrence of data loses not intended by a user which is caused by the user performing a pair operation in data copying of a cascade structure.

Claims17

Dependent claims

A computer system comprising:

a storage system;
and
a system management server which manages the computer system including the storage system, wherein:
the storage system comprises:
a primary logical volume which stores data;
and
a secondary logical volume which stores a copy of the data stored in the primary logical volume,
the primary logical volume and the secondary logical volume constituting a pair;
the system management server:
comprises a data management unit which manages the data stored in the logical volumes;
and
stores management information to manage the data stored in the logical volumes and the pair;
and
upon reception of a request for changing a pair status, the data management unit refers to the management information and determines data to be lost from the logical volume by the changing of the pair status, and outputs information regarding the data to be lost.

11 more elements

A computer system comprising:

a storage system;
and
a system management server which manages the computer system including the storage system, wherein:
the storage system comprises:
a primary logical volume which stores data;
a secondary logical volume which stores a copy of the data stored in the primary logical volume;
and
a third logical volume which stores a copy of the data stored in the secondary logical volume,
the primary logical volume and the secondary logical volume constituting a pair;
the system management server:
comprises a data management unit which manages the data stored in the logical volumes;
and
stores management information to manage the data stored in the logical volumes and the pair,
the management information comprising identifiers of the data stored in the logical volumes and information regarding a pair status;
the status of the pair comprises:
a first status in which updated data is copied to the secondary logical volume when the data stored in the primary logical volume is updated;
a second status in which the copying of the updated data is stopped;
and
a third status in which updated data is copied to the third logical volume when the data stored in the secondary logical volume is update;
the pair is subjected to operations comprised of:
split which changes the first status to the second status;
and
resync which changes the second status to the first status;
upon reception of a request for changing the status of the pair, the data management unit determines that no data is to be lost from the logical volume by the changing when the requested changing of the pair status is the split, compares the identifier of the data stored in the primary logical volume with the identifier of the data stored in the secondary logical volume when the requested changing of the pair status is the resync, and determines that, when both identifiers are different from each other, the data of the different identifier of the secondary logical volume is to be lost from the secondary logical volume by the changing of the pair status;
the data management unit further determines that, when the data stored in the secondary logical volume is determined to be lost and the pair status of the pair of the secondary logical volume and the third logical volume is the third status, data corresponding to the data determined to be lost from the secondary logical volume among the data stored in the third logical volume is to be lost from the third logical volume, outputs information regarding the data determined to be lost, cancels the requested changing of the pair status upon reception of an instruction not to execute the changing, executes the changing of the pair status upon reception of an instruction to execute the changing, and subsequently refers to the changed pair status and the data copied by the changing, and updates the management information.

22 more elements

A computer system comprising:

a system management server;
an application server coupled to the system management server;
a storage system coupled to the application server, wherein:
the storage system comprises:
a primary logical volume which stores data used in application by the application server;
and
a secondary logical volume which stores a copy of the data stored in the primary logical volume,
the primary logical volume and the secondary logical volume constituting a pair;
the system management server:
comprises a data management unit which manages the data stored in the logical volumes;
and
stores management information to manage the data stored in the logical volumes and the pair;
and
upon reception of a request for changing a status of data access to the logical volume from the application server, the data management unit refers to the management information and determines data to be lost from the logical volume by the changing of the status, and outputs information regarding the data to be lost from the logical volume.

11 more elements

A system management server which manages a computer system comprising a storage system,

the storage system comprising:
a primary logical volume which stores data;
and
a secondary logical volume which stores a copy of the data stored in the primary logical volume,
the primary logical volume and the secondary logical volume constituting a pair,
the system management server:
comprising a data management unit which manages the data stored in the logical volumes;
and
storing management information to manage the data stored in the logical volumes and the pair,
wherein, upon reception of a request for changing a status of the pair, the data management unit refers to the management information and determines data to be lost from the logical volume by the changing of the status, and outputs information regarding the data to be lost.

7 more elements

A method of controlling a computer system comprising a storage system, and a system management server which manages the computer system including the storage system,

the storage system comprising:
a primary logical volume which stores data;
and
a secondary logical volume which stores a copy of the data stored in the primary logical volume;
the primary logical volume and the secondary logical volume constituting a pair,
the system management server:
comprising a data management unit which manages the data stored in the logical volumes;
and
storing management information to manage the data stored in the logical volumes and the pair,
the method comprising:
a first step of controlling the data management unit to receive a request for changing a pair status;
a second step of referring to the management information and determining data to be lost from the logical volume by the changing of the pair status;
and
a third step of outputting information regarding the data to be lost.

11 more elements

Dependencies are inferred from the claim text.

Method of managing multistage copied data

Life of this patent

Method of managing multistage copied data

Life of this patent

Abstract

Claims17