Using HyperPAV Dedicated DASDs

Dedicated HyperPAV base devices operate in the traditional z/VM® manner. To use dedicated HyperPAV alias devices, the guest must contain support for managing and serializing the volume's data across the subchannels - an exploiting operating system. z/VM acts only as the pipe between the guest and the hardware. After the necessary base subchannel and associated alias subchannels are attached to the guest, the guest must manage their use. Dedicated HyperPAV alias I/O operations are restricted by z/VM to be able to access only HyperPAV base devices that are attached to the guest.

In a dedicated environment, the performance benefits of HyperPAV are entirely up to the operating system running in the virtual machine. z/VM will not make any attempt to optimize or alter the I/O flowing through the base and alias subchannels.