[ovirt-users] Re: Affinity rules in ovirt

> 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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