Two-Node Cluster With Minimum Disk Configuration And No - Compaq TruCluster Server AA-RHGWB-TE Manual

Figure 1–1 shows a generic two-node cluster with the minimum number
of disks.
• Tru64 UNIX disk
• Clusterwide root (/), /usr, and /var
• Member 1 boot disk
• Member 2 boot disk
A minimum configuration cluster may have reduced availability due to the
lack of a quorum disk. As shown, with only two-member systems, both
systems must be operational to achieve quorum and form a cluster. If only
one system is operational, it will loop, waiting for the second system to boot
before a cluster can be formed. If one system crashes, you lose the cluster.
Figure 1–1: Two-Node Cluster with Minimum Disk Configuration and No
Quorum Disk
Member
System
1
PCI SCSI
Adapter
Cluster File
System
root (/)
/usr
/var
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 TruCluster Server Cluster
1–6 Introduction
Network
Member
Memory Channel
System
PCI SCSI
Adapter
Tru64
UNIX
Disk
Shared SCSI Bus
Member 1 Member 2
root (/)
swap
2
root (/)
swap
ZK-1587U-AI