10.3. Virtual failover solutions
Another consideration for server farm operations is failover. Because z/VM controls the hardware, it can be seen as a single point of failure. Therefore, you might want a failover system in case z/VM suffers an outage.
Depending on company policy, there are three possibilities for a backup system: a duplicate image, a duplicate z/VM on another LPAR, or duplicate machines.
To maintain service during a system failure, company policy might state that a duplicate server must be available to back up the primary server. A physical hot-standby configuration duplicates acquisition and environmental costs for a server that you hope will never have to be online. With z/VM, the costs associated with a backup Linux virtual ...
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