System boot process:

  • Power on
  • PDC executes CPU, Memory and other tests
  • PDC initialize the console to display messages
  • Looks for Primary boot path
  • It loads and executes Initial System Loader (ISL). Roll of boot ROM ends.
  • ISL loads the secondary system loader called “hpux”. It resides on boot area of the disk
  • “hpux” loads “/stand/vmunix” into memory and hands control over to kernel
  • Kernel loads the device drivers
  • Swapper process started. It has process ID 0. It manages memory for swapping in and out. It schedules all other process. Its first job is to startup the init process.
  • /sbin/pre_init_rc getting executed. It checks and repairs root file system.
  • /sbin/init started. Process ID is 1.

    • It refers /etc/inittab. It does the following.
    1. read the /etc/inittab for default run level
    2. ioinitrc - It invokes insf command with -e option to find any new devices.
    3. bcheckrc - activates LVM and run fsck on file systems if required.
    4. /sbin/rc - It brings the system to the default run level. This script is run whenever the system moves from to a higher one or vice versa.
    5. /usr/bin/getty

    To add a program to the startup time:

    1. Execution script for starting and stopping is installed in /sbin/init.d directory
    2. Configuration files are placed in /etc/rc.config.d directory
    3. If script is to be run on run level 2, place a link to the execution script at /sbin/rc2.d directory

    HP-UX boot disk has a boot area. The files in this area are in the LIF format.
    Important parts of the boot area are

    1. ISL: Initial program loader
    2. hpux: Secondary system loader
    3. AUTO: contains hpux utility name and arguments to be passed to the hpux utility
    4. LIF volume header that identifies LIF volume
    5. File containing hp-ux volume name

    ISL Commands:

    ISL> hpux show autofile # To view the contents of AUTO file

    ISL> hpux -is boot # To boot the system in the single user mode

    ISL> hpux -lq boot # To ignore quorum and boot

    ISL> hpux -lm boot # To boot in the maintenance mode

    ISL> hpux -ll /stand # To list the files in the /stand directory

    HPUX Commands:

    setboot command is used to view or change the boot path in a running system
    To set the primary path to scsi.1.0 and auto boot on

    # setboot -p scsi.1.0 -b on

    To create an area on the boot disk for a LIF volume, boot utilities and BDRA

    # pvcreate -B /dev/rdsk/c0t0d0

    To place the boot utilities on the boot disk:

    # mkboot /dev/rdsk/c0t0d0

    To add an AUTO file in boot area:

    # mkboot -a “hpux (52.3.0;0)/stand/vmunix” /dev/rdsk/c0t0d0

    To List the contents of LIF volume

    # lifls -l /dev/dsk/c0t0d0

    lifcp command is used to copy files to or from the LIF volume
    To copy the contents of AUTO file to file1

    # lifcp /dev/rdsk/c0t0d0:AUTO file1 # Copies the contents of AUTO file to file1.

    *c n v from http://sys-admin.net/wiki/HP-UX/Startup

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