[ovirt-users] Question about Huge Pages

[Gianluca Cecchi]

On Wed, Apr 19, 2017 at 3:44 PM, Martin Polednik <mpolednik at redhat.com>
wrote:

>
>>
> If you are using recent CentOS (or I guess Fedora), there isn't any
> extra setup required. Just create the custom property:
>

Both my engine and my hosts are CentOS 7.3 + updates


>
> On the host where engine is running:
>
> $ engine-config -s "UserDefinedVMProperties=hugepages=^.*$"
> $ service ovirt-engine restart
>
> and you should see 'hugepages' when editing a VM under custom properties.
>

So no vdsm hook at all to install?



> Set the number to (desired memory / 2048) and you're good to go. The
> VM will run with it's memory backed by hugepages.


As in sysctl.conf? So that if I want 4Gb of Huge Pages I have to set 2048?



> If you need
> hugepages even inside the VM, do whatever you would do on a physical
> host.
>
> mpolednik
>
>
yes, the main subject is to have Huge Pages inside the guest, so that
Oracle RDBMS at startup detect them and use them

Gianluca
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