Do not increase the size of an existing disk, PI will _not_ recognize the increased size of an existing disk. Also, if you have increased the existing disk and have rebooted the PI VM, do not take the increased size away, it will cause disk signature to be corrupted and will require a tedious disk recovery or re-deployment of OVA.
vSphere client will restrict you to the possible max values for virtual sockets<-> vCPUs, it won't let you make impossible configuration.
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