Good info on the different isolation modes and recommendations on which one to use based on your infrastructure. vSphere4 the default policy in an HA cluster was to power off. The default in vSphere5 is to leave powered on. I have mixed opinions on this, but do agree just because your host lost management communications does not mean you would want to power off all of the vms running on that host. However if they do get powered off the negotiations of a downtime window do not have to be worked around. :) But wonder if one of those vm’s was your exchange server? You be the judge.
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NOTE: This post assumes that a Debian based OS is being used.