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[Zhenyu Zheng <zhengzhenyu@xxxxxxxxxx>]

Public bug reported:

Currently, after an instance launched with bootable volume and flavor
with non-zero disk. If we resize this instance to an flavor with zero
disk, Nova API will throw exception.

As for volume-backed instance, the root volume doesn't occupy any space
in nova-compute node. So it should not be limited by flavor's root_gb.

** Affects: nova
     Importance: Undecided
     Assignee: Zhenyu Zheng (zhengzhenyu)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Zhenyu Zheng (zhengzhenyu)

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https://bugs.launchpad.net/bugs/1480040

Title:
  Allow resize root_gb to 0 for volume-backed instances

Status in OpenStack Compute (nova):
  New

Bug description:
  Currently, after an instance launched with bootable volume and flavor
  with non-zero disk. If we resize this instance to an flavor with zero
  disk, Nova API will throw exception.

  As for volume-backed instance, the root volume doesn't occupy any
  space in nova-compute node. So it should not be limited by flavor's
  root_gb.

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