Understanding and Designing Serviceguard Disaster Recovery Architectures

Figure 7 Routing Highly Available Ethernet Connections in Opposite Directions

Node 1

Node 2

Node 5

Data Center C

Data Center BData Center A

Node 6

Node 3

From A to B

From A to C

Node 4

hub

bridge

hub

bridge hub

bridge

bridgebridge

Disaster Recovery Wide Area Networking

Disaster recovery networking for continental clusters is directly tied to the data replication method.

In addition to the redundant lines connecting the remote nodes, you also need to consider the

bandwidth required to support the data replication method you have chosen. A continental cluster

that handles a high number of transactions per minute requires a highly available network and a

large amount of bandwidth.

• Bandwidth and latency between two data centers affects the rate of data replication, and

therefore the currency of the data if you need to switch control to another site. The greater the

16 Disaster Recovery in a Serviceguard Cluster