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[Nova] Instances can't be started after compute nodes unexpectedly shut down because of power outage

Hi folks,
Because of power outage, Most of our compute nodes  unexpectedly shut  down
and now I can not start our instances.  Error message is "Failed to get
"write" lock another process using the image?". Instances Power status is
No State.  Full error log is My
environment is OpenStack Pike on Ubuntu 16.04 LTS servers and Instances are
on a nfs shared storage. Nova version is 16.1.6.dev2. qemu version is
2.10.1. libvirt version is 3.6.0. I saw a commit [1], but it doesn't solve
this problem.
There are important instances on my environment. How can I rescue my
instances? What would you suggest ?


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