Disaster Tolerance and Recovery in a Serviceguard Cluster
Understanding Types of Disaster Tolerant Clusters
Figure | Extended Distance Cluster |
In the above configuration the network and FC links between the data centers are combined and sent over common DWDM links. Two DWDM links provide redundancy. When one of them fails, the other may still be active and may keep the two data centers connected. Using the DWDM link, clusters can now be extended to greater distances which were not possible earlier due to limits imposed by the Fibre Channel link for storage and Ethernet for networks. Storage in both data centers is connected to both the nodes via two FC switches in order to provide multiple paths. This configuration supports a distance up to 100 kms between datacenter1 and datacenter2.
20 | Chapter 1 |