Technical data

Figure 1–1: Two-Node Cluster with Minimum Disk Configuration and No
Quorum Disk
Member
System
1
Network
Memory Channel
Shared SCSI Bus
PCI SCSI
Adapter
Member
System
2
PCI SCSI
Adapter
Cluster File
System
root (/)
/usr
/var
Member 1
root (/)
swap
Member 2
root (/)
swap
Tru64
UNIX
Disk
ZK-1587U-AI
Figure 1–2 shows the same generic two-node cluster as shown in Figure 1–1,
but with the addition of a quorum disk. By adding a quorum disk, a cluster
may be formed if both systems are operational, or if either of the systems and
the quorum disk is operational. This cluster has a higher availability than
the cluster shown in Figure 1–1. See the Cluster Administration manual for
a discussion of how and when to use a quorum disk.
1–6 Introduction