Single Quorum in Geographically Dispersed Clusters

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

It is possible to use a single quorum disk resource in a geographically dispersed cluster, provided the quorum is replicated across sites, such as through disk mirroring. When a single quorum is used across multiple sites, the quorum data must always use synchronous replication, although application data can be replicated either synchronously or asynchronously (assuming there are no application-specific restrictions). This is because the quorum could become corrupt during asynchronous replication, rendering different quorum data on each site, and your server cluster would then fail.