Menu configurations
In Red Hat® Enterprise Linux® 9.2, you can use zipl to prepare a DASD or SCSI boot disk with a menu configuration.
A boot device with a menu configuration can hold the code for multiple boot configurations. For SCSI and NVMe disks, the menu can also include one or more system dumpers.
Each boot and dump configuration in a menu is associated with a configuration number. At IPL time, you can specify a configuration number to select the configuration to be used.
For menu configurations on DASD, you can display a menu with the configuration numbers. For menu configurations on SCSI disks, you need to know the configuration numbers without being able to display the menus.