This is by design, in general nova tracks the amount of resources
allocated out not the amount being used. This is in part to make
scheduling more repeatable. Further more simple-tenant-usage is very
much a proof of concept and not something to really be used for anything
real.
What would you like to use the actual usage information for? If I
remember correctly there are plans in progress to support the model
where nova tracks actual usage and uses it for scheduling (as an
optional mode).
Overall this is more of a feature and not a bug per se.
** Changed in: nova
Status: New => Opinion
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https://bugs.launchpad.net/bugs/1324755
Title:
disk consumption report incorrect in host-describe and simple-tenant-
usage
Status in OpenStack Compute (Nova):
Opinion
Bug description:
simple-tenant-usage and host use
resource['disk_gb'] += (instance['root_gb'] +
instance['ephemeral_gb'])
to report disk size, however, the eph is maximum value can be
allocated to an instance , not its current usage
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