I am not trying to be sarcastic here, but the host resources are controlled by what you allocate to the vm... that is kinda how virtualization works On Fri, Oct 19, 2018 at 8:47 AM Jayme <jaymef(a)gmail.com&gt; wrote: > I'm wondering how I can best limit the ability of VMs to overrun the load > on hosts. I have a fairly stock 4.2 HCI setup with three well spec'ed > servers, 10Gbe/SSDs, plenty of ram and CPU with only a hand full of light > use VMs. I notice when the occasional demanding job is run on a VM I'm > seeing load average on host node shoot up in to the 20-30s, how can a > single "medium" vm cause host load to rise so high? > > > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/LVSVFSI2KXU... >

Yes I understand how virtualization works, but what I'm saying is that my hosts each have 16 cores, 256gb ram, 10GBe networking and all SSD storage with VMs allocation only a fraction of the available resources, yet high load on a single VM with 2 cpus and 4gb ram allocated can cause the host load to rise above 30. I'm trying to determine why one VM with limited resources can cause the load on the host to go up so much. On Sat, Oct 20, 2018 at 8:32 PM Donny Davis <donny(a)fortnebula.com&gt; wrote: > Also the nature of Converged compute and storage will cause more usage on > a host than you are used to seeing... Storage costs cpu/ram cycles too > > On Sat, Oct 20, 2018 at 7:29 PM Donny Davis <donny(a)fortnebula.com&gt; wrote: > >> I am not trying to be sarcastic here, but the host resources are >> controlled by what you allocate to the vm... that is kinda how >> virtualization works >> >> On Fri, Oct 19, 2018 at 8:47 AM Jayme <jaymef(a)gmail.com&gt; wrote: >> >>> I'm wondering how I can best limit the ability of VMs to overrun the >>> load on hosts. I have a fairly stock 4.2 HCI setup with three well spec'ed >>> servers, 10Gbe/SSDs, plenty of ram and CPU with only a hand full of light >>> use VMs. I notice when the occasional demanding job is run on a VM I'm >>> seeing load average on host node shoot up in to the 20-30s, how can a >>> single "medium" vm cause host load to rise so high? >>> >>> >>> _______________________________________________ >>> Users mailing list -- users(a)ovirt.org >>> To unsubscribe send an email to users-leave(a)ovirt.org >>> Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >>> oVirt Code of Conduct: >>> https://www.ovirt.org/community/about/community-guidelines/ >>> List Archives: >>> https://lists.ovirt.org/archives/list/users@ovirt.org/message/LVSVFSI2KXU... >>> >>

Le 23 oct. 2018 à 16:30, Oliver Riesener <Oliver.Riesener(a)hs-bremen.de&gt; a écrit : Yes, you are right, load 30 with a 2 CPU VM is nearly impossible.