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Capacity Requirements
Cluster configuration involves balancing each node's capacity so that resources perform optimally and either node can temporarily run the resources of the other during failover. The capacity requirements for cluster nodes are:

    * Hard-disk-storage. Each node in a cluster must have enough hard-disk capacity to store permanent copies of all applications and other resources required to run all groups. Plan disk space allowances so that either node can efficiently run all resources during failover.
    * CPU. Failover can strain the CPU processing capacity of an MSCS server when the server takes control of the resources from a failed node. If you don't plan properly, the CPU of a surviving node can be pushed beyond its practical capacity during failover, slowing response time. Plan your CPU capacity on each node so that it can accommodate new resources without greatly affecting responsiveness.
    * RAM. Each node in your cluster should have enough RAM to handle all applications that run on either node. Also, make sure to set the Windows NT paging files appropriately for each node's physical memory.