RHV: Thin-provisioned Guests with IO-Threads enabled crash

Solution Verified - Updated -

Issue

  • Cannot install OS on Virtual Machine, it dies.
  • After creating snapshot, the Virtual Machine dies.
  • During high IO load, the Virtual Machine pauses due to enospc and then crashes:
VM example.com has been paused due to no Storage space error.
VM example.com is down with error. Exit message: Lost connection with qemu process.

Environment

  • Red Hat Virtualization 4.2.8
    • Red Hat Enterprise Linux 7.6
      • qemu-kvm-rhev-2.12.0-18.el7_6.1.x86_64
    • Block Storage (iSCSI or Fibre-Channel)

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