[Engine-devel] Is there a 'Can run this VM?' query

[Omer Frenkel]

----- Original Message -----
> From: "Roy Golan" <rgolan at redhat.com>
> To: "Omer Frenkel" <ofrenkel at redhat.com>
> Cc: engine-devel at ovirt.org, "Yaniv Kaul" <ykaul at redhat.com>
> Sent: Monday, January 9, 2012 2:21:29 PM
> Subject: Re: [Engine-devel] Is there a 'Can run this VM?' query
> 
> 
> 
> ----- Original Message -----
> > From: "Omer Frenkel" <ofrenkel at redhat.com>
> > To: "Yaniv Kaul" <ykaul at redhat.com>
> > Cc: engine-devel at ovirt.org
> > Sent: Monday, January 9, 2012 2:06:58 PM
> > Subject: Re: [Engine-devel] Is there a 'Can run this VM?' query
> > 
> > 
> > 
> > ----- Original Message -----
> > > From: "Yaniv Kaul" <ykaul at redhat.com>
> > > To: engine-devel at ovirt.org
> > > Sent: Monday, January 9, 2012 9:36:34 AM
> > > Subject: [Engine-devel] Is there a 'Can run this VM?' query
> > > 
> > > Beaker automated test system
> > > (http://fedoraproject.org/wiki/QA/Beaker)
> > > would like to integrate with the project, via the REST API.
> > > Their main concern is that they'll provision VMs who would not be
> > > able
> > > to run on the ovirt setup.
> > > I think there are two cases here:
> > > 1. Provisioning a VM with X vCPUs, while there isn't a host
> > > available
> > > with such number of pCPUs (or similar in memory) - this is
> > > easier,
> > > as
> > > it
> > > can be 'calculated' from the setup beforehand and we can avoid
> > > such
> > > provisioning.
> > > 2. More difficult - in runtime, the hosts are over-committed and
> > > we
> > > cannot run a VM - can we, before trying to run a VM, ask if it's
> > > feasible? I know it's a point in time, and may be wrong in the
> > > next
> > > second, but if we go 'no' as an answer, it already provides good
> > > information to Beaker to continue and look elsewhere.
> > > Y.
> > >
> > 
> > there is no such query currently,
> if we're going to supply one, we either encapsulate the canDoAction
> to a class and re-use or
> supply a boolean argument on the parameter class, say "dryRun", to
> indicate command doesn't
> perform the execute part realy.

yep, RunVmCommand.CanRunVm() is public and static,
return boolean and even fill list messages.
this is why i said i think its easy to do it :)
just need to check it really covers anything and behave well

> > the answer to this question actually is lots of other questions
> > (status, storage, host availability and more)
> > BUT i think its rather easy creating such a query (though caller
> > need
> > to remember it might be a long one)
> >  
> > > _______________________________________________
> > > Engine-devel mailing list
> > > Engine-devel at ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > 
> > _______________________________________________
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> > Engine-devel at ovirt.org
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> > 
>