[Users] Force certain VMs to be on different hosts

[Gilad Chaplik]

----- Original Message -----
> From: "Ted Miller" <tmiller at hcjb.org>
> To: users at ovirt.org
> Sent: Monday, March 24, 2014 8:27:31 PM
> Subject: Re: [Users] Force certain VMs to be on different hosts
> 
> Scott
> 
> On 3/19/2014 10:30 AM, Scott Ocken wrote:
> > Ted,
> >
> > Yes!  This is exactly what I was looking for.  I think you described it
> > better than I did.  This feature would be really nice.
> >
> > Thanks
> > Scott
> >
> > Quoting Ted Miller <tmiller at hcjb.org>:
> >
> >> I think what the OP is asking for a designation as a "redundant group 1".
> >> He may have 10 hosts and 3 VMs in "redundant group 1". He doesn't care
> >> which hosts they run on, as long as they are three separate hosts.
> >>
> >> I can see this as being fairly widely applicable.  If you have multiple
> >> web servers for load sharing, you don't want them all running on the same
> >> host, because VM load is going to peak on them at the same times.  oVirt
> >> has no way of knowing that unless you give oVirt a hint to spread things
> >> around.  The web group might also want to split up the server that spreads
> >> the jobs around, and a database server used by all the web hosts.  I can
> >> see easily ending up with a group of 5 machines (3 web servers, a load
> >> sharing controller, and a database server) that you want spread across any
> >> 5 of the 15 servers in a cluster, because their loads are all going to
> >> spike together. You don't want oVirt having to try to migrate some of them
> >> during a load spike, because oVirt noticed that a host with 3 of the 5 is
> >> overloaded.
> >>
> >> Not my situation, but one I can see the usefulness of.
> >> Ted Miller
> >> Elkhart, IN, USA
> >>
> >> On 3/18/2014 11:54 AM, Meital Bourvine wrote:
> >>> Hi Scott,
> >>>
> >>> Click on a vm
> >>> Edit
> >>> Show Advanced Options
> >>> Host
> >>> "Start Running on"
> >>>
> >>> ----- Original Message -----
> >>>> From: "Scott Ocken" <scott at infobunker.com>
> >>>> To: Users at ovirt.org
> >>>> Sent: Tuesday, March 18, 2014 5:08:24 PM
> >>>> Subject: [Users] Force certain VMs to be on different hosts
> >>>>
> >>>> Is there a way to have certain VMs to be on different hosts? (assuming
> >>>> there are enough hosts)
> >>>>
> >>>> IE.  I have a db cluster of 3 VMs.  I would like each one to always be
> >>>> on different hosts.  That way if a host goes down my db cluster is
> >>>> still happy while migration happens.  Or if migration fails I am still
> >>>> good.
> >>>>
> >>>> Thanks
> >>>> Scott
> >>
> >> Ted Miller
> It looks like the Negative Affinity/Anti-Affinity feature that Itamar Hein
> pointed out in his email, with a feature page at
> http://www.ovirt.org/Features/VM-Affinity includes what you are trying to
> do.

+1 :-)

> This is in 3.4, which in the QA process now.

As far as I know this feature is fully tested and verified for version 3.4.
I'd love for feedback! and would like to assist in anything :)


> 
> Ted Miller
> Elkhart, IN, USA
> 
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