On 10/16/2017 05:31 AM, Nisha Agarwal wrote:
Hi Matt,
As i understand John's spec https://review.openstack.org/#/c/507052/
<https://review.openstack.org/#/c/507052/>, it is actually a replacement
for capabilities(qualitative only) for ironic. It doesnt cover the
quantitative capabilities as 'traits' are meant only for qualitative
capabilities. Quantitative capabilities are covered by resource classes
in Nova. We have few (one or two) quantitative capabilities already
supported in ironic.
Hi Nisha,
This may be a case of mixed terminology. We do not refer to anything
quantitative as a "capability". Rather, we use the term "resource class"
(or sometimes just "resource") to represent quantitative things that may
be consumed by the instance.
Traits, on the other hand, are qualitative. They represent a binary
on/off capability that the compute host (or baremetal node in the case
of Ironic) exposes.
There's no limit on the number of traits that may be associated with a
particular Ironic baremetal node. However, for Ironic baremetal nodes,
if the node.resource_class attribute is set, the Nova Ironic virt driver
will create a single inventory record for the node containing a quantity
of 1 and a resource class equal to whatever is in the
node.resource_class attribute. This resource class is auto-created by
Nova as a custom resource class.
Best,
-jay
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