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[Yaguang Tang <yaguang.tang@xxxxxxxxxxxxx>]

by default, nova doesn't allow disk over commit, so your actual disk
space is 50G in nova-compute node, you can't boot an instance with 100G
root disk flavor.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1336798

Title:
  Disk filter return false while instances booted from remote volumes

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  I am trying to boot instances from remote volumes, but it's scheduling failed. The error message is "Failed to scheduler_run_instance: No valid host was found." It is failing at DiskFilter.
  The remote volume has been created successful and status is available. Disk size of the flavor is 100G, but the free disk only has 50G on the nova-compute node.

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