Yes it is. Most organizations are realizing that VMware, and specifically HA with ESX 3, is a nice "in between"...
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solution. Meaning if you have an application that can't have two, three or four hours of downtime, but could sustain five or 10 minutes of downtime, HA might be just as good, with less complexity. Prior to VMware HA, you had to build a cluster using Microsoft Cluster Server or some other product. Of course this came with the added complexity of a cluster, additional operating systems to manage and so on.
With VMware HA, you get a solution for hardware failures that will essentially restart the virtual machine on a new host within a few minutes of the failure. Of course it's not an immediate failure like Microsoft Cluster Server, but it's much less complex than Microsoft Cluster Server if you already have VMware, and itreduces the number of operating systems you need to manage long term.
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