Method and apparatus for replicating volumes

Details Method and apparatus for replicating volumes Method and apparatus for replicating volumes

2008-01-08

2008-01-08

Kim, Hong (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S161000, C707S793000

Reexamination Certificate

active

07318133

ABSTRACT:
A method for operating a storage system includes providing a primary storage device and a secondary storage device. Data from a first storage volume is copied to a second storage volume using an internal mirror operation, the first and second storage volumes being provided within the primary storage device. The data received from the first volume is copied from the second storage volume to a third storage volume using a remote copy operation, the third storage volume being provided in the secondary storage device. The second storage volume is used for the remote copying to reduce the IO impact on the first volume. The third storage volume copies the data received from the second volume to a fourth storage volume using an internal mirror operation, the fourth storage volume being provided within the secondary storage device. The secondary storage system includes a fifth storage volume that is made available to a secondary host while the data from the third storage volume is being copied to the fourth storage volume, the secondary host being associated with the secondary storage device.

REFERENCES:
patent: 5245702 (1993-09-01), McIntyre et al.
patent: 6671705 (2003-12-01), Duprey et al.
patent: 2003/0191916 (2003-10-01), McBrearty et al.
patent: 2004/0073831 (2004-04-01), Yanai et al.

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