Data duplication system, data duplication method and program
AssigneeNEC Corporation
InventorsKazuyuki Nagumo, Naoki Soeda
Life of this patent
Estimating the term…
Abstract
It is to provide a data storage system which causes no delay in the access performance of a master volume in the snapshot action of a disk array subsystem. The data duplication system comprises a temporary data duplication control device and a data duplication control device. The temporary data duplication device functions in such a manner that the master volume and a buffer volume that is built between the master volume and a snapshot volume keep the same volume image. The data duplication control device functions to minimize the I/O load upon the master volume by switching the master volume and the buffer volume as appropriate as the actual data reference target of the snapshot volume.
Claims9
A data duplication system used for a storage device which stores master data in a duplication data storage area when updating the master data, the data duplication system comprising:
- a temporary storage area secured in the storage device for temporarily storing the master data to be stored in the duplication data storage area;
- a temporary data duplication control device for storing the master data in the temporary storage area;
- and
- a data duplication control device for determining a read-out target of the master data when reading out the master data via the duplication data storage area.
A data duplication method which manages data when storing master data in a duplication data storage area for updating the master data, the data duplication method comprising the steps of:
- a preparatory step for securing a temporary storage area for temporarily storing the master data to be stored in the duplication data storage area;
- a temporary storing step for storing the master data in the temporary storage area;
- and
- a data duplication step for determining a read-out target of the master data when reading out the master data via the duplication data storage area.
A program for data duplication system that allows a computer, which constitutes a data duplication system of a storage device that stores master data in a duplication data storage area when updating data of the master data, to execute:
- a function of securing a temporary storage area in the storage device for temporarily storing the master data to be stored in the duplication data storage area;
- a function of temporarily storing the master data in the temporary storage area;
- and
- a function of determining a read-out target of the master data when reading out the master data via the duplication data storage area.
Dependencies are inferred from the claim text.