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Storage Networking Fundamentals: An Introduction to Storage Devices, Subsystems, Applications, Management, and Filing Systems by Marc Farley

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Summary

This chapter examined the technology and methods of remote copy storage management applications. Remote copy is used to create data redundancy for disaster recovery purposes. With remote copy, writes are forwarded from a primary storage controller to a secondary and/or tertiary storage controller. Controllers in a remote copy system can be located locally within the same building or campus as well as remotely, hundreds of miles apart.

The requirements for remote copy systems can be extremely challenging. The performance of the remote copy system must be fast enough to not hinder a system's application performance, and write ordering of transmitted data must be guaranteed to ensure data consistency.

One of the constraints is the speed ...

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