The Value VCPUs_Max Must Be a Multiple of This Field in XCP-NG
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When I attempt to create a VM this is the error I receive:
"The Value VCPUs_Max must be a multiple of this field" is invalid for the field 'platform:cores-per-socket'.
If I don't specify sockets to cores per sockets this error does not appear and everything runs and reports correctly. If I specify 2 sockets with 1 core per socket it succeeds. This is nowhere near the maximum number of physical CPU's so I think it's strange that I am receiving this error. If I do this from Xen Center everything is fine with a single socket and 2 vCPU's per socket.
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I'm not sure that I follow your explanation of what you did. Can you tell the exact settings used and which one gave an error?
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See Topology
Error
No Error
No Error
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@wirestyle22 Looks like a Xen Orchestra bug. Xenserver itself doesn't care if you do 2 cores on 1 cpu or 1 core on 2 cpus.
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@Pete-S Right
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I haven't seen this, but I am using XCP-ng and I often can do the VMs through the XCP-ng client too.
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I generally just keep the default vCPU config and thus haven't seen this myself either.
It's possible that this is a bug though. With that @olivier would need to know exactly what version of xo-web and xo-server you're running, how you built your instance etc as well.
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My initial thought is that the configuration is saying how many socket do you want this guest to have, which then doesn't make sense when you say 1 CPU with 2 cores, when you have 2 listed in the above field.
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You can either have 2 vcpu and follow the default host config or you can have something that divides evenly based on the number of filled sockets your host has.
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Based on this the field is saying VCPUs_max has to be a multiple of cores per socket
And later this VCPUs_max must be a multiple of this field meaning what you're telling the system to create this guest with, doesn't make logical sense.
If you wanted the guest to have 2 CPU with 1 core each, you have to use the settings as shown in the second image. If you wanted this guest to have more CPU, set it to something like 8 and have the Topology be 2 cpu with 4 core each. Ideally mimic the hardware that your host has though.
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I'm guessing XenCenter is just running some behind the scenes magic and changing it to work, where XO is telling you to fix the issue.
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Tags updated as this is XCP-NG.
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@scottalanmiller It's not. I changed after I posted this.
