Thread here: http://communities.vmware.com/message/2135864
User as wondering why HA didn’t kick in when a host of his was disconnected in vcenter, and VMs were not responsive. The host had lost it's connection to the datastore.
So user was thinking, no datastore heartbeats, how come HA didn’t fail over the vms until the host was manually powered off?
They key to note was that he was able to ssh in to the host with an error.
As mention by eziskind:
"HA currently only responds to total host failures and network isolation/partition. You can ssh into the host which indicates this is a different kind of failure (storage failure perhaps?). HA doesn't respond to these kind of failures yet - we're working on it though."
For a better understanding of HA check out Duncan Epping's HA deep dive:
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