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The method for updating things like ram and vcpus using vmadm is different for KVM zones than for SmartOS zones. The json input is not required and will fail silently. Instead use vmadm directly:

{code:title=Updating vcpus|borderStyle=solid}
vmadm update <zone id> vcpus=4

{code:title=Updating ram|borderStyle=solid}
vmadm update <zone id> ram=4096

(where the units of the RAM argument are megabytes)