Remote data mirroring

Details Remote data mirroring Remote data mirroring

2007-07-03

2007-07-03

Le, Dieu-Minh (Department: 2114)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S707000

Reexamination Certificate

active

11213497

ABSTRACT:
Two data storage systems are interconnected by a data link for remote mirroring of data. Each volume of data is configured as local, primary in a remotely mirrored volume pair, or secondary in a remotely mirrored volume pair. Normally, a host computer directly accesses either a local or a primary volume, and data written to a primary volume is automatically sent over the link to a corresponding secondary volume. Each remotely mirrored volume pair can operate in a selected synchronization mode including synchronous, semi-synchronous, adaptive copy-remote write pending, and adaptive copy-disk. Direct write access to a secondary volume is denied if a “sync required” attribute is set for the volume and the volume is not synchronized.

REFERENCES:
patent: 3588839 (1971-06-01), Belady et al.
patent: 3623014 (1971-11-01), Doelz et al.
patent: 3771137 (1973-11-01), Barner et al.
patent: 3835260 (1974-09-01), Prescher et al.
patent: 3866182 (1975-02-01), Yamada et al.

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