Booting from DASD (LPAR)

SUSE Linux Enterprise Server 15 SP5 LPAR mode

Use the SE or HMC to boot Linux® in LPAR from a DASD boot device.

Before you begin

You need a boot device that is prepared with GRUB 2.

Procedure

Perform these steps to boot from a DASD:

  1. In the navigation pane of the HMC, expand Systems Management and select the hardware system that you want to work with. A table of LPARs is displayed on the Partitions tab in the content area.
  2. Select the LPAR where you want to boot Linux.
  3. In the Tasks area, expand Recovery and click Load (see Figure 1).
    Figure 1. Load task on the HMC
    Screen capture of the Hardware Management Console. In the Tasks area, expand the Recovery list and click Standard load.
  4. Select load type Standard load (see Figure 2).
    Select the Clear the main memory on this partition before loading it check box only if you must clear memory. Memory clearing can considerably prolong the IPL procedure.
    Figure 2. Load panel for booting from DASD
    Screen capture of the Load panel. Ensure that load type Standard load is selected.
  5. Enter the device number of the DASD boot device in the Load address field.
    To IPL from a subchannel set other than 0, specify five digits: The subchannel set ID followed by the device number, for example 1E711.
  6. Enter a specification of the form <parm>g<grub_parameters> in the Load parameter filed.
    <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 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.
  7. Click OK to start the boot process.

DASD menu configuration example for LPAR

This example illustrates how a zipl menu is displayed on the HMC or SE.
 zIPL interactive boot menu

  0. default (grub2)

  1. grub2
  2. skip-grub

 Note: VM users please use '#cp vi vmsg <number> <kernel-parameters>'

 Please choose (default will boot in 30 seconds): 1

Specify 0 or 1 to immediately start GRUB 2 and proceed with booting the target kernel. Specify 2 to start a rescue kernel. If you do not select a menu item before the timeout expires, GRUB 2 is started.

What to do next

Check the output on the preferred console to monitor the boot progress.