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Kraft & Kennedy, Inc. provides technology and strategic consulting services to law firms, corporate legal departments and financial services firms. We can help you analyze, plan, implement and manage business and technology solutions to optimize your organization's functionality and processes.
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With the release of VMware vSphere 4, VMware has released a very powerful management tool called Fault Tolerance (FT). At a basic level, FT allows you to keep two virtual machines (a Primary VM and a Secondary VM) running in lockstep on two different physical ESX hosts. If one of the ESX hosts were to experience a hardware failure, the VM protected with FT would remain running on the second host without any downtime. This can greatly reduce downtime due to hardware failures and provide increased service levels for important applications.
FT is often compared to Microsoft Windows Failover Clusters, formerly Microsoft Cluster Server (MSCS), and in fact many have talked about how FT can replace Microsoft clustering altogether. Rather than jump to conclusions like this, it is important to understand the use cases for both technologies. In addition, there are several limitations to FT that need to be considered. Here are some important points to remember about FT:
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