Booting from DASD (z/VM)

Perform these steps to start the boot process:

1. Establish a CMS or CP session with the z/VM guest virtual machine where you want to boot Linux.
2. Ensure that the boot device is accessible to your z/VM guest virtual machine.
3. Issue a command of this form:

   #cp i <devno> clear loadparm <parm>g<grub_parameters> parm <kernel_parameters>

   where:

   <devno>

   specifies the device number of the boot device as seen by the guest.

   loadparm <parm>

   selects the kernel to be booted, a site context, or both.

   Kernel to be booted

   0 or 1

   immediately starts GRUB 2 for booting the target SUSE Linux Enterprise Server 15 SP5 kernel.

   2

   boots a rescue kernel.

   If you omit this specification, GRUB 2 is started after a timeout period has expired. Depending on your configuration, a zipl boot menu might be displayed during the timeout period. From this menu, you can choose between starting GRUB 2 or booting a rescue kernel.

   Site specification

   Applies only to Linux in a site-specific context, see Site-specific Linux instantiation. Omit this parameter if you are not working with site-specific sections in zipl environments or with site-specific DASD configurations.

   To specify a site, you can use one of the following values for <parm>:

   S<n>

   Specifies the site ID for which site-specific kernel parameters and DASD configurations are to be used. The site ID <n> is a digit in the range 0 to 9.

   SS

   Uses the subchannel set ID (SSID) of the IPL device as the site ID, for example, if the SSID is 0, values for site 0 are used.

   S

   Uses the common specifications. Specifying a single capital S without a trailing site ID is equivalent to omitting the S parameter.

   If you work with a combination of menu configurations and site specifications, append the site specification to the menu specification without a blank. For example, 1S2 selects the first boot menu entry with the site 2 context.

   <grub_parameters>

   specifies parameters for GRUB 2. Typically, this specification selects a boot option from a GRUB 2 boot menu. For details, see Specifying GRUB 2 parameters.

   parm <kernel_parameters>

   is an optional 64-byte string of kernel parameters to be concatenated to the end of the existing kernel parameters that are used by your boot configuration.

   Important: Do not specify parameters that prevent SUSE Linux Enterprise Server 15 SP5 from booting. See Avoid parameters that break GRUB 2.

00: zIPL interactive boot menu
00:
00:  0. default (grub2)
00:
00:  1. grub2
00:  2. skip-grub
00:
00: Note: VM users please use '#cp vi vmsg <number> <kernel-parameters>'
00:
00: Please choose (default will boot in 30 seconds): #cp vi vmsg 1

#cp vi vmsg 1