Sun Cluster Concepts Guide for Solaris OS

Atypical Quorum Configurations

Figure 3–3 assumes you are running mission-critical applications (Oracle database, for example) on Host A and Host B. If Host A and Host B are unavailable and cannot access shared data, you might want the entire cluster to be down. Otherwise, this configuration is suboptimal because it does not provide high availability.

For information about the best practice to which this exception relates, see Adhering to Quorum Device Best Practices.

Figure 3–3 Atypical Configuration

Illustration: HostA-D. Host A/B connect to QD1-4. HostC
connect to QD4. HostD connect to QD4. Total votes = 10. Votes required for
quorum = 6.