Jeff from the Windows Virtualization Team Blog: Last week, I blogged about the importance of HA for unplanned host downtime. By the number of responses, this is clearly a hot topic. Today, I was going to discuss planned downtime, specifically, the differences between Quick Migration and Live Migration; however, after sifting through all that feedback last week I realized that we need to dispel some myths first...
After my last blog I received almost two dozen email telling me that VMotion was far superior for unplanned host downtime and that it was a much better HA solution because it could live migrate virtual machines. I’ve heard this fallacy espoused for many years and, folks, this simply isn’t the case.
In the case of unplanned downtime, VMotion can’t live migrate because there is no warning. Instead you must have VMware HA configured and the best it can do is restart the affected virtual machines on other nodes which is the same as what is provided with Windows Server 2008 Hyper-V and Failover Clustering.
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