On Wed, Nov 9, 2016 at 12:10 PM, Nathanaël Blanchet <blanchet@abes.fr> wrote:

Hi all,

I manage several hosts with different CPU type and I was wondering about good practices to create a cluster in ovirt.

I usually choose the lowest level to gather my hosts, Sandy Bridge seems to be good. Is there for instance some performance advantage to create a cluster per CPU type?

I mean, if i decide to create an independant cluster with the Broadwell family, what kind of advantage could this stuff bring to me? I know I couldn't force live migrate my guests to a lower CPU type cluster, so advantage must be greater than disadvantage.

It means more CPU features from the host are exposed to the guest. If it takes advantage of them is up to the guest and the applications within it.

For example, with Broadwell, you can get all the CPU features that are in[1].

[1] http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/cpu/cpu_map.xml;h=6da8321a69681e7a78ade6b7c5c9c871813bd5d8;hb=HEAD#l1126

thank you for help.

--
Nathanaël Blanchet

Supervision réseau
Pôle Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5
Tél. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
blanchet@abes.fr

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