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 Booting and Shutdown in HP-UX Release 11i Version 1.5 > Chapter 1 Booting and Shutdown in HP-UX Release 11i Version 1.5

Booting From an Alternate Kernel
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By default, the boot process will use the main kernel file /stand/vmunix to find the kernel to boot from. To boot from a different kernel, you must interact with the initial program loader (IPL/ISL) and specify a different main kernel file:

  1. Follow the procedure for booting from an alternate device (given below) to the point where you can interact with the initial program loader (IPL / ISL).

  2. As part of the device-file argument in the hpux boot command, specify the HP-UX path name of the main kernel file of the alternate kernel that you want to boot. For example:

    ISL> hpux boot disk(2/4.0.0;0)/stand/alt_kernel_file_name

NOTE: Although the kernel is no longer composed of the single main kernel file (by default /stand/vmunix); the main kernel file carries the name of the kernel and contains internal kernel identification that is used by the boot loader to obtain information about all of the kernel components that need to be loaded during the boot process.

If you have performed whole kernel configuration following the steps outlined in the white paper Reconfiguring the Kernel in HP-UX Release 11i Version 1.5, the newly configured kernel should have been properly updated using kmupdate(1M). By running kmupdate, not only does the newly configured kernel become bootable, but it becomes the default kernel accessible from /stand/vmunix. Therefore, you do not need to specify an alternate main kernel file path name to boot a newly configured kernel.

You may want to boot from a different kernel when /stand/vmunix fails to boot, and you want to boot from the previous kernel saved by the kmupdate command (/stand/vmunix.prev). You may also want to boot from a kernel with a different name that you have saved using the recommended procedures in the section "Saving a Backup Kernel Permanently" in the white paper Reconfiguring the Kernel in HP-UX Release 11i Version 1.5.



Chapter 1 Booting and Shutdown in HP-UX Release 11i Version 1.5
  		 


Booting From an Alternate Device  
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