1 core per socket (Invalid configuration)

msteini

I facing a "Invalid configuration" message in xcp-ng center when i deploy a vm with the following cpu settings:

If the VM is down i got the following error in the properties section:

Message in XCP-ng under "General -> CPUs":

I can reproduce this in two environments:

XCP-ng Cluster Version 8.2
Cloudstack 4.17.2 with XCP-ng Version 8.2

The VMs are running and on the command line in the VM i can see all 24 Cores.

Is there any known issue or limitation with that?

Thank you!

olivierlambert

Hi,

XCP-ng Center isn't a supported client for XCP-ng. Try to reproduce to XO so we can understand if it's the client or a host issue. Thanks!

msteini

@olivierlambert

Thank you for your feedback. I checked it in xoa. If i take a look at the VM with 24 cores in advanced tab -> "VM limits", it shows the following:

If i take a look for example at a VM with 8 Cores, it looks like this:

What does under VM limits ->Topology "Default behavior" mean at the VM with 24 core?

Thanks!

andyhhp

You're trying lie to the VM and tell it that it's running on a system with 24 physical sockets, each with a single core.

For reference, 2 sockets is the biggest AMD server that you can buy (these days), and Intel top out at 8. If you want a larger system, you could buy a SuperDome which can manage up to 32 sockets (before hitting other limits of UPI switching).

The various historical enumeration schemes can't encode that high, which is why there's a sanity check in XenCenter.

You typically want 1 socket, so select 24 cores / socket.

~Andrew