12:04 a.m.
----- Original Message -----
From: "s k" <sokratis123k(a)outlook.com>
To: "Doron Fediuck" <dfediuck(a)redhat.com>
Cc: users(a)ovirt.org, "Michal Skrivanek" <mskrivan(a)redhat.com>
Sent: Saturday, June 14, 2014 1:33:26 PM
Subject: RE: [ovirt-users] Resource Pools in oVirt
That's great Doron! Especially the QoS Policy sounds almost like the VMware
Resource Pools. Looking forward for the next release then!
Actually I'd expect a better implementation as we hand aspects which
are not available in Resource Pools.
By the way, since we are talking about CPU shares, the default option
when
creating a VM is 'disabled'. How is that compared with the Low/Medium/High
options in terms of CPU priority?
According to the docs[1]:
"If this is omitted, it defaults to the OS provided defaults."
I guess it would be interesting to check this while it's running to get
the actual number from your run.
Doron
[1] http://libvirt.org/formatdomain.html#elementsCPUTuning
> Date: Fri, 13 Jun 2014 04:29:09 -0400
> From: dfediuck(a)redhat.com
> To: sokratis123k(a)outlook.com
> CC: users(a)ovirt.org; mskrivan(a)redhat.com
> Subject: Re: [ovirt-users] Resource Pools in oVirt
>
> ----- Original Message -----
> > From: "s k" <sokratis123k(a)outlook.com>
> > To: users(a)ovirt.org
> > Sent: Wednesday, June 11, 2014 12:18:35 AM
> > Subject: [ovirt-users] Resource Pools in oVirt
> >
> > Hello all,
> >
> > As far as I understand, CPU Shares can be set on each VM individually and
> > cannot be changed while it's powered on.
> >
> >
> > It would be great if we could create resource pools (similar to what
> > VMware
> > does) for CPU shares so that we could assign priorities on multiple VMs
> > and
> > be able to move them between Resource Pools of different priorities. I
> > know
> > that we can configure quotas but it's not the same as CPU shares.
> >
> > Is that something planned for a future release? Shall I open an RFE for
> > that
> > ?
> >
> > Regards,
> >
> > Sokratis
> >
>
> Hi Sokratis,
> thanks for the feedback.
>
> We have an RFE[1] opened to allow changing shares dynamically for a VM
> while it's
> running.
>
> As you probably know VMWare's implementation handles much more than shares,
> so
> it's a wider concept.
>
> In oVirt we've been working hard to introduce QoS elements during 3.3 and
> 3.5
> versions[2]. Once we have it all in place we'll start heading for the next
> level
> (up) which will be a Policy to aggregate QoS aspects for a VM. Once we have
> a
> policy you'll be able to assign it to multiple VMs and have much better
> control
> over resource including a planning element. So you should be monitoring the
> Policy
> task progress once we start working on it.
>
> So... as you can understand this is a lot of work (which I'm sure was the
> same
> for VMWare when they did it). Until then you'll be able to handle it using
> [1]
> I expect to happen in the next version, and as always- patches are
> welcomed!
>
> Thanks,
> Doron
>
> [1] Bug 1103537 - [RFE] Dynamic CPU Shares
> [2] QoS aspects:
> http://www.ovirt.org/Features/CPU_SLA
> http://www.ovirt.org/Features/Network_QoS
> http://www.ovirt.org/Features/blkio-support