[ovirt-users] vm "maximum memory" setting questions

[Michal Skrivanek]

> On 18 Apr 2017, at 11:46, Nelson Lameiras <nelson.lameiras at lyra-network.com> wrote:
> 
> Hello,
> 
> A new vm setting "maximum memory" has appeared in oVirt >4 which by default has the value "current memory”*4

In 4.1

> 
> - Why is "maximum memory" setting necessary to set?

> - Why isn't this value set to "infinity" by default ?

Because it’s recommended to be about 4x the startup size by linux kernel

> 
> It seems to me kind of uselessly counter productif to have to decide a maximum memory amount beforehand. if we do this, will we have to set maximum CPU cores also in the future (being devil's advocate here ;) )

You don’t have to decide, you can keep the default 4x.
For CPUs it is not currently needed and is set according to engine-config maximum supported by qemu-kvm - 288 in 4.1

Thanks,
michal
.
> 
> I did searched oVirt documentation, but very little information is available.
> Maybe this is an libvirt question, but I'm hopping a oVirt guru could quickly enlighten me.
> 
> cordialement, regards,
> 
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> Nelson LAMEIRAS
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