cluster node 1

cluster

cluster

node 2

node 3

cluster node 4 (backup)

Figure 1-2. N+1 Failover

Table 1-3 provides a N+1 failover configuration for the cluster shown in Figure 1-2. For each cluster resource group, the failover order in the Preferred Owners list provides the order that you want that resource group to failover. If that resource group or its cluster node fails, the cluster will try to fail that resource group to the first available node in the list. In this example, node 1 owns cluster resource group A, node 2 owns cluster resource group B, and node 3 owns cluster resource group C. Cluster resource groups A, B, or C would failover to cluster node 4, if cluster node 1, 2, or 3 fails, respectively.

Table 1-3. N+1 Failover Configuration for a 4-Node Cluster

Cluster Resource Group

Failover Order in the Preferred

 

Owners List

 

 

A

1, 4

B

2, 4

C

3, 4

 

 

NOTE: When implementing this type of failover solution, failback should be config- ured if the cluster node lacks the resources (such as memory or processing power) to support one or more cluster node failures.

Multiway Failover

Multiway failover is an activen/active failover solution where running applications from a failed node migrate to multiple nodes in the cluster. This activen/active type of failover provides the following features:

Advantage:

Automatic failover and load-balancing between the cluster nodes.

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Dell FL100, FE100 manual Multiway Failover, N+1 Failover Configuration for a 4-Node Cluster

FL100, FE100 specifications

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