[Users] Power Management question

[Laszlo Hornyak]

----- Original Message -----
> From: "Ayal Baron" <abaron at redhat.com>
> To: "Livnat Peer" <lpeer at redhat.com>
> Cc: users at ovirt.org, "Laszlo Hornyak" <lhornyak at redhat.com>
> Sent: Thursday, February 2, 2012 12:54:22 PM
> Subject: Re: [Users] Power Management question
> 
> 
> 
> ----- Original Message -----
> > On 02/02/12 13:41, Ayal Baron wrote:
> > > 
> > > 
> > > ----- Original Message -----
> > >> On 02/02/12 10:57, Laszlo Hornyak wrote:
> > >>> Hi,
> > >>>
> > >>> Yes, the ovirt backend does not shut down or power up any hosts
> > >>> directly, it can work only through vdsm. Therefore you need one
> > >>> running host per datacenter to be able to manage the rest of
> > >>> the
> > >>> hosts.
> > >>>
> > >>> I understand the motivation, but for smaller installations I
> > >>> believe it would be so great if the backend could do it as
> > >>> well.
> > >>> What vdsm does in the background is not much more than calling
> > >>> the
> > >>> ipmipower command.
> > >>>
> > >>
> > >> I agree, there is no real reason not to fence hosts from the
> > >> management
> > >> host, yet another feature we would love to have.
> > >>
> > >> Worth checking if the engine can reuse the vdsm code for
> > >> fencing.
> > > 
> > > This would come for free once we have the all in one (vdsm
> > > running
> > > on the same host as engine).
> > 
> > We'll get it for 'free' when installing VDSM on the same host as
> > the
> > engine, but the above can be useful even if the user don't install
> > VDSM
> > on the engine machine.
> 
> I was suggesting that vdsm always be installed on the same host as
> there are other such services that the engine could benefit from...

Yeah, that may be an easy solution, we could just use the vdsClient to run commands in local, but that would also bring all of vdsm's dependencies, like libvirt to the engine node. Or maybe the fence-agents package could be enough?

> 
> > 
> > > 
> > >>
> > >>
> > >>> Laszlo
> > >>>
> > >>> ----- Original Message -----
> > >>>> From: "Perry Myers" <pmyers at redhat.com>
> > >>>> To: "Spyro Polymiadis" <spyro at rsp.com.au>
> > >>>> Cc: users at ovirt.org
> > >>>> Sent: Thursday, February 2, 2012 4:16:12 AM
> > >>>> Subject: Re: [Users] Power Management question
> > >>>>
> > >>>> On 02/01/2012 10:13 PM, Spyro Polymiadis wrote:
> > >>>>> so, if i read that right - does this mean that i need to have
> > >>>>> 2
> > >>>>> nodes
> > >>>>> in the cluster to get this working (thats the only difference
> > >>>>> from
> > >>>>> the rhev environment) i havent moved the other hypervisors
> > >>>>> into
> > >>>>> it
> > >>>>> yet... i figured the manager host could perform the power
> > >>>>> management..
> > >>>>
> > >>>> That's my understanding, but I could be wrong :)  The
> > >>>> vdsm/oVirt
> > >>>> Engine
> > >>>> folks would know better
> > >>>>
> > >>>> Try moving a 2nd host over and see if that resolves the issue
> > >>>> _______________________________________________
> > >>>> Users mailing list
> > >>>> Users at ovirt.org
> > >>>> http://lists.ovirt.org/mailman/listinfo/users
> > >>>>
> > >>> _______________________________________________
> > >>> Users mailing list
> > >>> Users at ovirt.org
> > >>> http://lists.ovirt.org/mailman/listinfo/users
> > >>
> > >> _______________________________________________
> > >> Users mailing list
> > >> Users at ovirt.org
> > >> http://lists.ovirt.org/mailman/listinfo/users
> > >>
> > 
> > 
>