When to Boot a System

Reason for System Reboot	Appropriate Boot Option	Information for SPARC Based Systems	Information for x86 Based Systems
Turn off system power due to anticipated power outage.	Turn system power back on.	Chapter 10, Shutting Down a System (Tasks)	Chapter 10, Shutting Down a System (Tasks)
Change kernel parameters in the `/etc/system` file.	Reboot the system to run level 3 (multiuser level with NFS resources shared).	SPARC: How to Boot a System to Run Level 3 (Multiuser Level)	x86: How to Boot a System to Run Level 3 (Multiuser)
Perform file system maintenance, such as backing up or restoring system data.	Press Control-D from run level S to bring the system back to run level 3.	SPARC: How to Boot a System to Run Level S (Single-User Level)	x86: How to Boot a System to Run Level S (Single-User Level)
Repair a system configuration file such as `/etc/system`.	Interactive boot.	SPARC: How to Boot a System Interactively	x86: How to Boot a System Interactively
Add or remove hardware from the system.	Reconfiguration boot (also to turn on system power after adding or removing hardware).	Setting Up Disks for UFS File Systems (Task Map) in System Administration Guide: Devices and File Systems	Setting Up Disks for UFS File Systems (Task Map) in System Administration Guide: Devices and File Systems
Boot the system by using the kernel debugger (`kmdb`) to track down a system problem.	Booting with the `kmdb` option.	SPARC: How to Boot the System With the Kernel Debugger (`kmdb`)	x86: How to Boot a System With the Kernel Debugger in the GRUB Boot Environment (`kmdb`)
Boot the system in failsafe mode to repair an important system file that is causing system boot failure.	Booting the failsafe archive.	How to Boot a SPARC Based System in Failsafe Mode	How to Boot an x86 Based System in Failsafe Mode
To recover from a hung system and force a crash dump.	Performing a recovery boot	SPARC: How to Force a Crash Dump and Reboot of the System	x86: How to Force a Crash Dump and Reboot of the System

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