[Engine-devel] [Design for 3.2 RFE] Improving proxy selection algorithm for Power Management operations

[Eli Mesika]

----- Original Message -----
> From: "Itamar Heim" <iheim at redhat.com>
> To: "Eli Mesika" <emesika at redhat.com>
> Cc: "engine-devel" <engine-devel at ovirt.org>, "Dan Kenigsberg" <danken at redhat.com>
> Sent: Thursday, November 8, 2012 5:25:48 PM
> Subject: Re: [Engine-devel] [Design for 3.2 RFE] Improving proxy selection algorithm for Power Management operations
> 
> On 11/07/2012 08:43 PM, Eli Mesika wrote:
> > Hi
> >
> > Please review , any comments are welcomed
> >
> > Requirements :
> > http://wiki.ovirt.org/wiki/Features/HostPMProxyPreferences
> > Detailed Design :
> > http://wiki.ovirt.org/wiki/Features/Design/DetailedHostPMProxyPreferences
> >
> > DR for this RFE will be next week, exact schedule & place will
> > follow.
> 
> 1. what's the logic on deciding to move to next proxy ? is it per
> action
> (restart being comprised of stop and start. can the stop and start
> happen from different proxies)?

Yes, it is per action so stop & start may use different proxies.

> 
> 2. I'm guessing for 'engine' as proxy, vdsm will be installed with
> engine on same host.
> 
> is the plan to teat it as a separate instance of vdsm, listening on a
> separate port, or to assume an all-in-one deployment always?
> if it is added as a host, just for fencing, it requires special
> treatment for that host. while if added as a separate instance (on a
> different tcp port), it doesn't have to be defined as a host in the
> system.
> 
> iirc, we can install vdsm, and launch multiple instances of it (at
> least
> we could in the past).

we have 3 options here 
1) VDSM instance 
2) Lightweight VDSM (with only PM abilities)
3) Accessing the fenece-agents package scripts directly

I have talked with danken , he think we should apply 3)  


> 
> 3. i didn't understand the fqdn/ip proxy mode, if it is not an
> existing
> host in the system, how will engine communicate with it over secure
> xml/rpc? (i can understand selecting a specific host, but not a text
> box
> for fqdn/ip).

Good point, I will change the design accordingly 

> 
> thanks,
>     Itamar
>