Solaris Boot Process -1

Boot Process
0.Power On the server
1. Boot PROM

• PROM load POST
• OK prompt
• Boot loader load from boot devices
• Boot reads Boot Block (first 15 sectors)
• a copy of the bootblk is available at /usr/platform/`arch - k`/lib/fs/ufs/bootblk
• Boot load Boot block

2. Boot Program

• Boot Block loads secondary Boot loader(UFS boot)
• (/platform/`arch -k`/ufsboot) UFS boot will load kernel
  Kernel is two parts
  Gen UNIX =>Platform independent (/kernel/genunix )
  Unix => Platform dependant (/platform/`arch -k`/kernel/*)

3. Kernel Initialization

• Kernel reads config files(/etc/system)
• Kernel initializes itself & load modules
• Force load option in /etc/system –used to mount module permanently
• The kernel creates PID 0 ( sched)

4. Init phase

• The kernel start PID1 -init (/sbin/init)
• Init process reads /etc/inittab file and /etc/init/default
• Init starts rc scripts (/sbin/rc#) [# indicate runlevel]
• rc script executes the files in /etc/rc#.d