Comment 3 for bug 1252185

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Gary W. Smith (gary-w-smith) wrote :

Agree with chenhaiq that nova api does not return this information. The 'image' field in 'nova show' only indicates that it was booted from a volume but does not specify which volume.

It is also problematic to try to infer the boot volume by assuming that the boot volume is the only volume mounted or that it is mounted on a particular device (e.g. /dev/vda).