CPU Type compatibility matrix
Hello, In my case I currently have a cluster with hosts with cpu Intel E5-2680 v4 (each socket with 14 cores) and their Cluster is set as "Intel Broadwell Family" and I would like to add in the same oVirt Cluster two more hosts with Intel E5-2640 v4 cpus (each socket 10 cores) that should be the same CPU Family Type. Is it true? Is there a sort of matrix where one could compare and match? Thanks in advance, Gianluca
The matrix is basically Intel ARK - oVirt, from my understanding, will set the cluster to the minimum supported set of instructions. Meaning if they are identical instruction sets across all CPU's - then nothing is lost, but if even 1 CPU in the cluster has less available features then the rest, then all will be brought down to that level so to speak. There may be some major incompatibilities im not aware of, but with at least 2CPU's in the same family, I don't think you would be losing much if any. On 10/12/19 8:18 pm, Gianluca Cecchi wrote:
Hello, In my case I currently have a cluster with hosts with cpu Intel E5-2680 v4 (each socket with 14 cores) and their Cluster is set as "Intel Broadwell Family" and I would like to add in the same oVirt Cluster two more hosts with Intel E5-2640 v4 cpus (each socket 10 cores) that should be the same CPU Family Type. Is it true? Is there a sort of matrix where one could compare and match?
Thanks in advance, Gianluca
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On 10 Dec 2019, at 11:57, Joseph Goldman <joseph@goldman.id.au> wrote:
The matrix is basically Intel ARK - oVirt, from my understanding, will set the cluster to the minimum supported set of instructions. Meaning if they are identical instruction sets across all CPU's - then nothing is lost, but if even 1 CPU in the cluster has less available features then the rest, then all will be brought down to that level so to speak. There may be some major incompatibilities im not aware of, but with at least 2CPU's in the same family, I don't think you would be losing much if any.
yep plus if you really really need later cpu features for a specific VM which you would pin on this special host you can always use VM setting of Host CPU Passthrough which just uses all instructions the host has.
On 10/12/19 8:18 pm, Gianluca Cecchi wrote:
Hello, In my case I currently have a cluster with hosts with cpu Intel E5-2680 v4 (each socket with 14 cores) and their Cluster is set as "Intel Broadwell Family" and I would like to add in the same oVirt Cluster two more hosts with Intel E5-2640 v4 cpus (each socket 10 cores) that should be the same CPU Family Type. Is it true? Is there a sort of matrix where one could compare and match?
Thanks in advance, Gianluca
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Actually oVirt simply makes the node you initially install the HostedEngine on the baseline, which is why it says in the docs that you should run it from your "oldest" machine to ensure it doesn't fall over in case an even older host wins the contest for running the management engine VM after "HCI teleportation". I know, because it's one of the many things I did wrong first time around ;-) RTFM
participants (4)
-
Gianluca Cecchi -
Joseph Goldman -
Michal Skrivanek -
thomas＠hoberg.net