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A Solaris system is designed to stay up continuously, with as few disruptions to service through rebooting as possible. This design is facilitated by a number of key highavailability and redundancy features in Solaris, including the following: Dual power supplies A secondary supply can continue to power the system if the primary power supply fails. Mirroring of disk data The system can generally continue to operate even in the face of multiple disk failure. Hot-swappable disks You can remove a faulty disk and replace it while the system is still online. You can format and use the new disk immediately, especially when you use DiskSuite. The use of domains on StarFire and E10000 systems You can perform maintenance on one virtual host while a second domain acts in its place. However, there are two situations in which a Solaris system must be halted by the superuser: Performing a reconfiguration boot Powering down the system Note that you can use the drvconfig command to recognize most new hardware devices, further reducing the need for rebooting. A number of different commands are available to shut down and halt a system, and which one to use depends on the specific situation at hand. For example, some commands cycle through a series of shutdown scripts that ensure that key applications and services, such as databases, are cleanly shut down. Others commands are designed to ensure that a system is powered down as rapidly as possible. For example, if a storm strikes out the main power system and you re left with only a few minutes of battery backup, it might be wise to perform a rapid powerdown, to protect equipment from further damage. The next several
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sections investigate the following commands: init, shutdown, reboot, poweroff, and halt. These commands can only be run as the root user.
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The shutdown command is used to change a system s state, performing a similar function to init, as described earlier. However, shutdown has several advantages over init: You can specify a grace period, so that the system can be shut down at some future time rather than immediately. A confirmation message requires the superuser to confirm the shutdown before it proceeds. If an automated shutdown is to be executed at some future time, you can avoid the confirmation message by using the y option. Only init states 0, 1, 5, 6, and S can be reached using shutdown. For example, to shut down the system to run-level 5, so that you can move the system, you would use the following command, giving 60 seconds notice:
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# shutdown -i 5 -g 60 "System will be powered off for maintenance. LOGOUT NOW."
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This prints the following messages at 60 and 30 seconds, respectively:
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Shutdown started. Tue Feb 12 12:00:00 EST 2004 Broadcast Message from root (pts/1) on cassowary Tue Feb 12:00:00 EST 2004... The system will be shut down in 1 minute System will be powered off for maintenance. LOGOUT NOW. Shutdown started. Tue Feb 12 12:00:30 EST 2004 Broadcast Message from root (pts/1) on cassowary Tue Feb 12:00:30 EST 2004... The system will be shut down in 30 seconds System will be powered off for maintenance. LOGOUT NOW.
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Once the countdown has been completed, the following message appears:
Do you want to continue (y or n):
If you type Y, the shutdown proceeds. If you type N, the shutdown is cancelled and the system remains at the current run level.
Rebooting
The reboot command is used to reboot the system, from the current run level to the default run level, and not to change to any other run level. The reboot command has
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