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:
- The private and public network connections between cluster nodes must appear as a single, non-routed LAN that uses technologies such as virtual LANs (VLANs). In these cases, the connections network must be able to provide a guaranteed, maximum round-trip latency between nodes of no more than 500 milliseconds. The Cluster Interconnect must appear as a standard LAN.
- Any geographically replicated storage technologies must preserve single disk semantics, such as persistent arbitration of a LUN-to-Windows Clustering. The quorum disk must be replicated in real-time, synchronous mode across all sites.
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).
ID articolo: 280743 - Ultima revisione: 07 gen 2008 - Revisione: 1