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0e1f616
(Get the code!)
instance.root_gb means size of host local disk used by the instance root disk. All code that uses this attribute treats it that way.
Volume-backed instances have root disks placed in Cinder. Therefore obviously root_gb should be 0 for them. However currently this is not so. The same applies to min_size and size image attributes, used for boot from a volume.
As a result the code which uses these attributes works incorrectly. Some problems are already detected [1], other are not yet [2].
To fix all these problems fully it is proposed to set root_gb, min_size, size to 0 for volume-backed instances.
[1] https:/
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[2] https:/
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