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CPU Hotpluging does not work correctly on windows 2012r2 Standard

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Hello,

we would like to use this nice CPU Hotplugfeature. I've done like the wikipage: https://pve.proxmox.com/wiki/Hotplug...s_Guests_notes Add cores in the webinterface works fine, but can't see the cores in Windows, not even after a reboot. Do i something wrong? Here is my VMconfig:

Code:

bootdisk: virtio0
cores: 4
cpuunits: 50000
hotplug: disk,network,usb,memory,cpu
ide0: none,media=cdrom
ide2: none,media=cdrom
memory: 3584
name: hotplugtest2012
net0: virtio=96:54:8B:F5:BB:78,bridge=vmbr0,tag=11
numa: 1
ostype: win8
scsihw: virtio-scsi-pci
smbios1: uuid=abfc59ad-efc6-4615-a1b5-0fd23155a0bb
sockets: 1
vcpus: 2
virtio0: local:113/vm-113-disk-1.qcow2,format=qcow2,size=42G

Thanks and best Regards

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