On Wed, Apr 19, 2017 at 3:44 PM, Martin Polednik <mpolednik@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