RHEL7 on Hyper-V with fast startup enabled fails to boot or hangs up

Solution Unverified - Updated -

Issue

  • Configure Automatic Startup on Hyper-V virtual machines, which is a feature that VMs on Hyper-V start automatically when the physical machine starts, and then power on the physical machine and Hyper-V.
  • After starting the physical machine and Hyper-V, all VMs will power on but fail to boot or hang up.

Environment

  • Red Hat Enterprise Linux 7
  • Hyper-V with fast startup enabled

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