The title is provocative, but if we agree that Virtual I/O Server is part of the POWER Hypervisor it’s absolutely true. The command viosvrcmd is a HMC command which allows to perform any non-interactive VIO commands by a HMC user which has the taskrole authority – ‘VirtualIOServerCommand’ and visibility to a VIOS LPAR without be prompting for VIOS user and password.

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