Hi,
The storage QoS is provided by libvirt directly. Ovirt only sets
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, 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!
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