Hi, The storage QoS is provided by libvirt directly. Ovirt only sets <blkiotune> element in the VM domain XML[1].
For the algorithm details, you could ask on the libvirt mailing list: https://libvirt.org/contact.html Best regards, Andrej [1] - https://libvirt.org/formatdomain.html#elementsBlockTuning On Thu, 30 May 2019 at 08:55, <m.isa...@kwebbl.com> wrote: > Hello! > > We are using oVirt 3.6 in our infrastructure and storage QoS in passive > state (they are configured but not applie) for some of the servers. Last > time we needed to activate QoS on high load servers and it caused storage > load decrease. And this situation has raised some questions: > > 1. What happened to overlimit storage traffic, when QoS applying on high > load virtual machine: > a) All over traffic is pulling into some queue, where all disk > transactions can be successfully finished with QoS throughput? > b) All over-limitation data is dropped and opened transactions failed? > c) All active transactions finishes on speed beyond QoS, but all new > transactions immediately start to work based on configured limits? > > 2. How QoS mechanism actually works? Does it use some oVirt specific > functions or it uses some system features to limit storage, network or CPU > usage? If system one, then the QoS are provided by libvirt (using virsh or > directly) or system kernel options and which one? > > Thanks in advance! > _______________________________________________ > Users mailing list -- users@ovirt.org > To unsubscribe send an email to users-le...@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/RX4XVW73EKECWLJJ74RFXF6FUGAFDNDT/ >
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