What you should know about the z/VM unit record device driver
The z/VM unit record device driver is compiled as a separate module, vmur.
To load the vmur module automatically at boot time, see the section on persistent module loading in Configuring basic system settings (https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/configuring_basic_system_settings/index)
When the vmur module is loaded, it registers a character device. The following device nodes are created for a unit record device when it is set online:
- Reader: /dev/vmrdr-0.0.<device_number>
- Punch: /dev/vmpun-0.0.<device_number>
- Printer: /dev/vmprt-0.0.<device_number>