DELL FL100 User Manual
1-8
User’s Guide
Disadvantage:
•
Must ensure that the failover cluster nodes have ample resources available to
handle the additional workload.
handle the additional workload.
Figure 1-3 shows an example of multiway failover configuration.
Figure 1-3. Example of a 4-Node Multiway Failover
Table 1-4 provides an example of a multiway failover configuration for the cluster
shown in Figure 1-3. For each cluster resource group, the failover order in the
Preferred Owners list outlines the order that you want that resource group to failover.
In this example, node 1 owns cluster resource groups A, B, and C. If node 1 fails, the
cluster resource groups A, B, and C will failover to cluster nodes 2, 4, and 3, respec-
tively. The cluster resource groups on cluster nodes 2, 3, and 4 need to be configured
similarly.
shown in Figure 1-3. For each cluster resource group, the failover order in the
Preferred Owners list outlines the order that you want that resource group to failover.
In this example, node 1 owns cluster resource groups A, B, and C. If node 1 fails, the
cluster resource groups A, B, and C will failover to cluster nodes 2, 4, and 3, respec-
tively. The cluster resource groups on cluster nodes 2, 3, and 4 need to be configured
similarly.
NOTE: When implementing this type of failover solution, failback should be config-
ured to avoid performance degradation.
ured to avoid performance degradation.
Cascading Failover
With Cascading failover, all running applications migrate from the failed node to the
next preassigned cluster node. If you do not make a failover selection, cascading
failover will be the default failover type. This type of failover provides the following
features:
next preassigned cluster node. If you do not make a failover selection, cascading
failover will be the default failover type. This type of failover provides the following
features:
Table 1-4. Example of a 4-Node Multiway Failover Configuration
Cluster Resource Group
Failover Order in the
Preferred Owners List
A
1, 2, 3, 4
B
1, 4, 2, 3
C
1, 3, 4, 2
cluster
node 1
node 1
cluster
node 2
node 2
cluster node 3
cluster node 4
Application A
Application B
Application C