Migrating Symantec Veritas Cluster Server to HP Serviceguard for Linux

Technical white paper | Migrating Symantec Veritas Cluster Server to HP Serviceguard for Linux
• Quorum Server software
Quorum Server can be used as a membership arbitration method for multiple clusters at a time. The Quorum Server does
not have any limitation in terms of number of nodes in a cluster. The Quorum Server can be configured as a Serviceguard
package or standalone, but in either case it must run on a system outside of the cluster for which it is providing quorum
services. The Quorum Server listens to connection requests from the Serviceguard nodes on a known port. The server
maintains a special area in memory for each cluster, and when a node obtains the cluster lock, this area is marked so that
other nodes can recognize the lock as “taken”. The operation of the Quorum Server in a 2-node cluster is shown in the
following diagram (figure 2). When there is a loss of communication between node 1 and node 2, the Quorum Server
chooses one node (in this example, node 2) to continue running in the cluster. The other node (node 1) is reset.
Figure 2. 2-node SG/LX cluster using Quorum Server as a cluster lock
The following diagram shows a Quorum Server providing quorum service to multiple clusters.
Figure 3. Single Quorum Server providing quorum service to multiple clusters
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