Installation and Troubleshooting Guide

Understanding Your Failover Cluster 49
N + I Failover
N + I failover is an active/passive policy where dedicated passive cluster
node(s) provide backup for the active cluster node(s). This solution is best for
critical applications that require dedicated resources. However, backup nodes
add a higher cost of ownership because they remain idle and do not provide
the cluster with additional network resources.
Figure 4-1 shows an example of a 6 + 2 (N + I) failover configuration with six
active nodes and two passive nodes. Table 4-8 provides an N + I failover
matrix for Figure 4-1.
Figure 4-1. Example of an N+I Failover Configuration for an Eight-Node Cluster
.
Table 4-8. Example of an N+I Failover Configuration for an Eight-Node Cluster
Cluster Resource Group Primary Node AntiAffinityClassNames Value
A Node 1 AString
B Node 2 AString
C Node 3 AString
D Node 4 AString
E Node 5 AString
F Node 6 AString
cluster
node 3
cluster
node 4
cluster
node 5
cluster node 8
(backup)
cluster
node 1
cluster
node 2
cluster
node 6
cluster node 7
(backup)