Multi-site Clustering

Standard clustering addresses only availability at a single site - it provides no protection against a site-wide outage or disaster. That scenario is handled by multi-site or "stretch" clustering.

Multi Site Cluster

Advantages

Maximum availability - Protects against all types of downtime, including site-wide outage.

Disadvantages

Highest solution cost - The main additional cost in this architecture is for the communications link to carry data replication traffic between the two site, closely followed by the cost of additional servers and storage at the second site. However, these costs can be minimised by making productive use of the infrastructure at the second site as, for example, a test & development environment. The remaining costs are small in comparison to the consequences of an extended outage due to a disaster, and most businesses consider disaster recovery a sound investment as a result.

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