Hi Team,
Affinity rule is not working as expected, I created a affinity group and
added two VMs and one host (say TestHost2) (NOTE : two hosts available)
with following configuration
"enforcing": "true",
"hosts_rule": {
"enabled": "true",
"enforcing": "true",
"positive": "false"
},
"positive": "true",
"vms_rule": {
"enabled": "true",
"enforcing": "true",
"positive": "true"
},
But both the VMs are coming up in TestHost1, Am I missing something?
Thanks,
Hari
On Mon, Oct 15, 2018 at 4:05 PM Martin Sivak <msi...@redhat.com> wrote:
> > I have found that migration doesn't work when using
> vms_rule Enforcing Hard.
> > Scenario vms in an affinity group with Enforcing Hard no host members
> when trying to migrate vms it comes back with no host to migrate to even
> when selecting all vms in the affinity group.
>
> Yes you are right, the engine checks one by one. We do not support
> group migration in the scheduler. It was never considered important
> enough to offset the development costs (the internal architecture
> would have to change significantly). The workaround is to relax the
> affinity rule a bit first, do the migration and restore the affinity
> rule.
>
> Martin Sivak
>
> On Mon, Oct 15, 2018 at 12:13 PM, Staniforth, Paul
> <p.stanifo...@leedsbeckett.ac.uk> wrote:
> > Hello,
> > I have found that migration doesn't work when using
> vms_rule Enforcing Hard.
> > Scenario vms in an affinity group with Enforcing Hard no host members
> when trying to migrate vms it comes back with no host to migrate to even
> when selecting all vms in the affinity group.
> >
> > Regards,
> > Paul S.
> > ________________________________________
> > From: Martin Sivak <msi...@redhat.com>
> > Sent: 15 October 2018 09:43
> > To: Darrell Budic
> > Cc: Ovirt Users
> > Subject: [ovirt-users] Re: Affinity rules in ovirt
> >
> > Hi,
> >
> >> 3) What is the difference between VM to VM affinity and VM to Host
> affinity?
> >
> > - VM - VM rule expresses the relationship of all running VMs from the
> > specified list to each other.
> > - VM - Host rule describes the relationship of all running VMs from
> > the list to the selected hosts
> >
> >> Say I have 2 hosts, so what happens in case of failure of host running
> the VMs?
> >
> > VMs that are not up are not considered by scheduler. So it will
> > (assuming those are highly available VMs) start the first VM somewhere
> > and then the second VM will be started at the same host where the
> > first one is running.
> >
> >> Enforcing will keep the scheduler from launching a VM if it can’t meet
> those
> >> criteria, and will try and make changes to which hosts are running
> where if
> >> it can. If you don’t set it, it will still try and launch VMs on
> different
> >> hosts, but if it can’t, it will still launch the VM.
> >
> > Correct.
> >
> >> It also won’t make
> >> changes to bring all VMs into compliance with the Affinity rules, from
> what
> >> I can tel.
> >
> > It will try that too, but rather less aggressively.
> >
> >
> > Best regards
> >
> > Martin Sivak
> >
> > On Sun, Oct 14, 2018 at 7:59 PM, Darrell Budic <bu...@onholyground.com>
> wrote:
> >> VM to VM affinity will try and run the VMs on the same host if
> positive, and
> >> different hosts if negative.
> >>
> >> VM to Host affinity will try and run the VM on a specific set of Hosts
> if
> >> positive, and not on those hosts if negative.
> >>
> >> Enforcing will keep the scheduler from launching a VM if it can’t meet
> those
> >> criteria, and will try and make changes to which hosts are running
> where if
> >> it can. If you don’t set it, it will still try and launch VMs on
> different
> >> hosts, but if it can’t, it will still launch the VM. It also won’t make
> >> changes to bring all VMs into compliance with the Affinity rules, from
> what
> >> I can tel.
> >>
> >> On Oct 14, 2018, at 8:15 AM, Hari Prasanth Loganathan
> >> <hariprasant...@msystechnologies.com> wrote:
> >>
> >> Hi Team,
> >>
> >> I tried to follow up the affinity rules using this tutorial :
> >> https://www.youtube.com/watch?v=rs_5BSqacWE but I have few
> clarifications in
> >> it.,
> >>
> >> 1) I understand the VM to VM affinity, It means both the individual VMs
> >> needs to run on a single common host, Say I have 2 hosts, so what
> happens in
> >> case of failure of host running the VMs?
> >> 2) If I create a affinity group and I get the following data,
> >> i) What is host rule / vms rule - enabled, enforcing and
> >> positive ?
> >>
> >> "enforcing": "true",
> >> "hosts_rule": {
> >> "enabled": "true",
> >> "enforcing": "true",
> >> "positive": "false"
> >> },
> >> "vms_rule": {
> >> "enabled": "false",
> >> "enforcing": "true",
> >> "positive": "false"
> >> }
> >>
> >> 3) What is the difference between VM to VM affinity and VM to Host
> affinity?
> >>
> >> Doc's are not very clear, so please any help is appreciated.
> >>
> >> Thanks,
> >> Hari
> >>
> >>
> >>
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