What you should know about the z/VM unit record device driver
When the vmur module is loaded, it registers a character
device with dynamic major number and a minor number region from 0x0 to 0xffff.
The minor number corresponds to the virtual device number of the virtual unit record device. A mechanism like udev is needed to automatically generate the respective device nodes. The default udev rules create the following device nodes:
- Reader: /dev/vmrdr-0.0.<device_number>
- Punch: /dev/vmpun-0.0.<device_number>
- Printer: /dev/vmprt-0.0.<device_number>