Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Understanding Serviceguard Software Components
How the Cluster Manager Works
Chapter 348
The operation of the quorum server is shown in Figure 3-3. 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 halts.
Figure 3-3 Quorum Server Operation
A quorum server can provide quorum services for multiple clusters.
Figure 3-4 illustrates quorum server use across four clusters.