Hi Guys,

1) I have an use case in affinity rule, say
  i) I have two VMs and two Hosts
 ii) I created a affinity group, which has the Vm to Vm affinity rule as negative
 
  so when I start the both the VMs, One Vm settled in one Host and another VM settled in another Host

2) Now I try to migrate one of the VM from Host 1 to Host 2, It is throwing an error saying It violates affinity rule (since Vm to Vm affinity rule as negative)

I agree the use case is correct and working as expected.

I see the ovirt API as https://{BASE_URL}/ovirt-engine/api/hosts, which list all the hosts available, Is there an API which list only the host applicable for VM migration for the VM ?

Thanks,
Hari




I need an API to




On Tue, Oct 16, 2018 at 12:52 PM Martin Sivak <msivak@redhat.com> wrote:
Hi,

> "hosts_rule": {"enabled": "true", "enforcing": "true", "positive": "false" },

Notice positive: false. You created a rule which repels those VMs from
the host you selected.

Martin

On Tue, Oct 16, 2018 at 7:47 AM, Hari Prasanth Loganathan
<hariprasanth.l@msystechnologies.com> wrote:
> 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 <msivak@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.Staniforth@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 <msivak@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 <budic@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
>> >> <hariprasanth.l@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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