Hi, A new parameter will be added to endpoint '/ovirt-engine/api/hosts' in 4.3, 'migration_target_of' which lists exactly that. Here is the documentation: http://ovirt.github.io/ovirt-engine-api-model/4.3/#services/hosts/methods/li... I don't think it can be done using the 4.2 API. Andrej On Tue, 16 Oct 2018 at 14:00, Hari Prasanth Loganathan < hariprasanth.l@msystechnologies.com> wrote:
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
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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On Tue, Oct 16, 2018 at 7:47 AM, Hari Prasanth Loganathan <hariprasanth.l@msystechnologies.com> wrote: this
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