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[Zhenyu Zheng <zhengzhenyu@xxxxxxxxxx>]

Public bug reported:

Nova cannot rebuild Volume-Booted instances, patch:

https://review.openstack.org/#/c/176891/

fixes rebuild for instances launched using image and attached with volumes, but yet rebuilding an instance booted from volume
is still not working.

The rebuild action for volume-booted instances after implementing the
above patch performs like this:

The volumes are detached and attached again, the selected image/snapshot
for rebuilding is actually useless.

This means that if the /dev/vda for an instance booted from volume is broken for some reason, we cannot rebuild it from a new
image or the snapshot of this instance (nova just detach and attach again the same volume).

** 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/1470702

Title:
  Cannot Rebuild Volume Booted Instance

Status in OpenStack Compute (Nova):
  New

Bug description:
  Nova cannot rebuild Volume-Booted instances, patch:

  https://review.openstack.org/#/c/176891/

  fixes rebuild for instances launched using image and attached with volumes, but yet rebuilding an instance booted from volume
  is still not working.

  The rebuild action for volume-booted instances after implementing the
  above patch performs like this:

  The volumes are detached and attached again, the selected
  image/snapshot for rebuilding is actually useless.

  This means that if the /dev/vda for an instance booted from volume is broken for some reason, we cannot rebuild it from a new
  image or the snapshot of this instance (nova just detach and attach again the same volume).

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