cluster

cluster

node 1

node 2

Application A

cluster

cluster

node 3

node 4

Figure 1-5. Example of a 4-Node N-Way Migration Solution

Table 1-5 provides an overview of the failover types implemented with Datacenter Server.

Table 1-5. Failover Configurations

Failover

Description

Advantage

Disadvantage

Type

 

 

 

 

 

 

 

N + 1

One server provides

High resource avail-

Backup cluster

 

backup for multiple

ability

node may lack the

 

servers in the cluster

 

resources to

 

 

 

support multiple

 

 

 

cluster node

 

 

 

failures

Multiway

Running applications

Application load

Must ensure that

 

migrate to multiple

balancing

the failover cluster

 

nodes in the cluster

 

nodes have ample

 

 

 

resources available

 

 

 

to handle the addi-

 

 

 

tional workload

Cascading

Running applications

Higher availability

The cluster node

 

migrate to the next

 

next in line for

 

pre-assigned cluster

 

failover may not

 

node

 

have ample

 

 

 

resources available

 

 

 

to handle the addi-

 

 

 

tional workload of

 

 

 

the failed node

N-Way

Any running applica-

Added flexibility

Solution is not

migration

tion(s) are manually

and adjustable

automatic

 

migrated to any node

resource

 

 

in the cluster

allocation

 

 

 

 

 

1-10 User’s Guide

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Dell FE100, FL100 manual Example of a 4-Node N-Way Migration Solution, Failover Configurations

FL100, FE100 specifications

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