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Hi,

Which Nova driver are you using? Make sure you're using HyperVClusterDriver, which will ensure that instances will be failed over when a host goes down.

Check out the following page for more details about the cluster driver: http://compute-hyperv.readthedocs.io/en/latest/configuration/index.html#driver-configuration

There are a couple of config options (described in the above doc) that need to be set in order to ensure that failed over instances won't be turned off by Nova.