Article ID: 280743 - View products that this article applies to.
This article was previously published under Q280743
Geographically dispersed (majority node set) server clusters are built on a networking and storage infrastructure with characteristics that are very different from a standard quorum device server cluster. Therefore, they are certified under a separate testing program. If you want to convert your existing server cluster to a geographically dispersed server cluster, work with your hardware vendor to obtain a geographically dispersed server cluster configuration that has been certified by Microsoft.
You can create many geographically distributed solutions by adding data-replication software and extended Local Area Network (LAN) hardware to existing certified configurations. However, these solutions radically change the nature of a precertified configuration, particularly with respect to timing and latency. Therefore, Microsoft requires that, for it to be supported by Microsoft, the hardware and software configuration of a geographically dispersed cluster be one that is certified and listed on the cluster Hardware Compatibility List (HCL). For additional information about the HCL and Windows Clustering, click the following article number to view the article in the Microsoft Knowledge Base:
309395Nonqualified software solutions on existing signed hardware are not supported.
(http://support.microsoft.com/kb/309395/ )The Microsoft support policy for server clusters, the Hardware Compatibility List, and the Windows Server Catalog
You can use Windows Clustering to implement geographically dispersed clusters in scenarios where you can deploy the members of a single cluster on several different sites. Windows Clustering does not detect the extended nature of these types of clusters, and it is the responsibility of the network and storage architectures that are used to build these geographic clusters to preserve the semantics. In particular:
Configurations must be certified with a maximum supported distance between nodes for a particular site interconnect (such as a certified configuration with nodes that are one mile apart that uses fiber that is not supported if the nodes are deployed more than one mile apart or if the interconnect is copper).
For additional information, visit the following Microsoft Web site:
Article ID: 280743 - Last Review: February 28, 2007 - Revision: 6.4