IT managers and executives have enthusiastically embraced server virtualization because it greatly increases server utilization, reduces capital costs and cuts operating expenses. And a growing number of IT executives are looking beyond server consolidation to use virtualization for simpler, more efficient disaster recovery and application availability. By enabling IT managers to move virtual machines (and the applications they host) between physical servers, server virtualization gives them a powerful method for reducing planned downtime and speeding recovery. But protecting virtual machines from unplanned downtime and unforeseen outages is a challenge. Traditional approaches to ensuring application availability are complex and costly, and these shortcomings are amplified when applied to virtual environments. Adding cost and complexity can erode the cost savings and efficiency benefits of server virtualization.
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