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> On Apr 11, 2017, at 12:54 AM, Nisha Agarwal <agarwalnisha1980 at gmail.com> wrote:
> 
> Hi John,
> 
> >With ironic I thought everything is "passed through" by default,
> >because there is no virtualization in the way. (I am possibly
> >incorrectly assuming no BIOS tricks to turn off or re-assign PCI
> >devices dynamically.)
> 
> Yes with ironic everything is passed through by default. 
> 
> >So I am assuming this is purely a scheduling concern. If so, why are
> >the new custom resource classes not good enough? "ironic_blue" could
> >mean two GPUs and two 10Gb nics, "ironic_yellow" could mean one GPU
> >and one 1Gb nic, etc.
> >Or is there something else that needs addressing here? Trying to
> >describe what you get with each flavor to end users?
> Yes this is purely from scheduling perspective. 
> Currently how ironic works is we discover server attributes and populate them into node object. These attributes are then used for further scheduling of the node from nova scheduler using ComputeCapabilities filter. So this is something automated on ironic side, like we do inspection of the node properties/attributes and user need to create the flavor of their choice and the node which meets the user need is scheduled for ironic deploy.
> With resource class name in place in ironic, we ask user to do a manual step i.e. create a resource class name based on the hardware attributes and this need to be done on per node basis. For this user need to know the server hardware properties in advance before assigning the resource class name to the node(s) and then assign the resource class name manually to the node. 
> In a broad way if i say, if we want to support scheduling based on quantity for ironic nodes there is no way we can do it through current resource class structure(actually just a tag) in ironic. A  user may want to schedule ironic nodes on different resources and each resource should be a different resource class (IMO). 
> 
> >Are you needing to aggregating similar hardware in a different way to the above
> >resource class approach?
> i guess no but the above resource class approach takes away the automation on the ironic side and the whole purpose of inspection is defeated.
> 

I strongly challenge the assertion made here that inspection is only useful in scheduling contexts. There are users who simply want to know about their hardware, and read the results as posted to swift. Inspection also handles discovery of new nodes when given basic information about them.

-
Jay Faulkner
OSIC

> Regards
> Nisha
> 
> 
> On Mon, Apr 10, 2017 at 4:29 PM, John Garbutt <john at johngarbutt.com> wrote:
> On 10 April 2017 at 11:31,  <sfinucan at redhat.com> wrote:
> > On Mon, 2017-04-10 at 11:50 +0530, Nisha Agarwal wrote:
> >> Hi team,
> >>
> >> Please could you pour in your suggestions on the mail?
> >>
> >> I raised a blueprint in Nova for this https://blueprints.launchpad.ne
> >> t/nova/+spec/pci-passthorugh-for-ironic and two RFEs at ironic side h
> >> ttps://bugs.launchpad.net/ironic/+bug/1680780 and https://bugs.launch
> >> pad.net/ironic/+bug/1681320 for the discussion topic.
> >
> > If I understand you correctly, you want to be able to filter ironic
> > hosts by available PCI device, correct? Barring any possibility that
> > resource providers could do this for you yet, extending the nova ironic
> > driver to use the PCI passthrough filter sounds like the way to go.
> 
> With ironic I thought everything is "passed through" by default,
> because there is no virtualization in the way. (I am possibly
> incorrectly assuming no BIOS tricks to turn off or re-assign PCI
> devices dynamically.)
> 
> So I am assuming this is purely a scheduling concern. If so, why are
> the new custom resource classes not good enough? "ironic_blue" could
> mean two GPUs and two 10Gb nics, "ironic_yellow" could mean one GPU
> and one 1Gb nic, etc.
> 
> Or is there something else that needs addressing here? Trying to
> describe what you get with each flavor to end users? Are you needing
> to aggregating similar hardware in a different way to the above
> resource class approach?
> 
> Thanks,
> johnthetubaguy
> 
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