[ovirt-users] Re: Affinity rules in ovirt

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(a)redhat.com&gt; 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(a)msystechnologies.com&gt; 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(a)redhat.com&gt; 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(a)leedsbeckett.ac.uk&gt; 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(a)redhat.com&gt; > >> > 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(a)onholyground.com&gt; > >> > 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(a)msystechnologies.com&gt; 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 > >> >> > >> >> > >> >> > >> >> DISCLAIMER - MSysTechnologies LLC > >> >> > >> >> > >> >> This email message, contents and its attachments may contain > >> >> confidential, > >> >> proprietary or legally privileged information and is intended solely > >> >> for the > >> >> use of the individual or entity to whom it is actually intended. 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