Re: [Users] Force certain VMs to be on different hosts

From: "Ted Miller" <tmiller(a)hcjb.org&gt; To: users(a)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(a)hcjb.org&gt;: > >> 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(a)infobunker.com&gt; >>>> To: Users(a)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.

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

Ted Miller Elkhart, IN, USA _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users