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Double-Take® Software Announces Enhancements to GeoCluster  
August 2007   

Cluster Services (MSCS), Double-Take® Software announced several new features to its GeoCluster® product which include 64-bit support, integration of Microsoft Volume Shadow Copy Service, and improved shared data verification. GeoCluster, the only software on the market that integrates directly with MSCS to extend its capabilities, provides a high level of application availability through real-time data replication and failover.

GeoCluster functions by removing the single point of failure inherent in the shared-disk architecture of MSCS and maintaining a separate copy of the shared data on each node in the cluster. By replicating changes to this shared data using continuous byte-level replication the cluster nodes can be placed in different geographical locations, ensuring availability of the application in the event of a major disaster.

As part of its new enhancements, GeoCluster has improved its ability to actively determine the status of replicated data and ensure that services only failover to a cluster node which holds an up-to-date, consistent copy of the shared data. Another enhancement, snapshot integration using Microsoft’s Volume Shadow Copy Service, also provides the administrator the ability to recover from logical corruption or other unwanted changes by reverting a cluster node’s copy of the shared data to a previous point-in-time before bringing that node online.

August 2007  
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