12-07-2009
Quote:
Originally Posted by
arunkumardk
* Momentary Press button provides behavior identical to pressing the physical power button.
* Press and Hold is identical to pressing the physical power button for five seconds and then releasing it. This option provides the ACPI-compatible functionality that is implemented by some operating systems. These operating systems behave differently depending upon a short press or long press. The behavior of this option might circumvent any graceful shutdown features of the operating system.
* Cold Boot of the system immediately removes power from the system. The system will restart after approximately six seconds. This option is not available when the server is powered down. This option circumvents graceful operating system shutdown features.
* Reset System initiates a system reset. This option is not available when the server is powered down. The behavior of this option might circumvent any graceful shutdown features of the operating system.
Thanks a lot for your reply. Can you pls clarify 3rd and 4th option . Which one is ungraceful shutdown and graceful?
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REBOOT(8) BSD System Manager's Manual REBOOT(8)
NAME
halt, reboot -- stopping and restarting the system
SYNOPSIS
halt [-lnqu]
reboot [-lnq]
DESCRIPTION
The halt and reboot utilities flush the file system cache to disk, send all running processes a SIGTERM (and subsequently a SIGKILL) and,
respectively, halt or restart the system. The action is logged, including entering a shutdown record into the wtmp(5) file.
When the system is halted with the halt command, the system is powered off.
The options are as follows:
-l The halt or reboot is not recorded in the system log. This option is intended for applications such as shutdown(8), that call reboot
or halt and log this themselves.
-n The file system cache is not flushed. This option should probably not be used.
-q The system is halted or restarted quickly and ungracefully, and only the flushing of the file system cache is performed (if the -n
option is not specified). This option should probably not be used.
-u The system is halted up until the point of removing system power, but waits before removing power for 5 minutes so that an external
UPS (uninterruptible power supply) can forcibly remove power. This simulates a dirty shutdown to permit a later automatic power on.
OS X uses this mode automatically with supported UPSs in emergency shutdowns.
Normally, the shutdown(8) utility is used when the system needs to be halted or restarted, giving users advance warning of their impending
doom and cleanly terminating specific programs.
SIGTERM TO SIGKILL INTERVAL
The SIGKILL will follow the SIGTERM by an intentionally indeterminate period of time. Programs are expected to take only enough time to
flush all dirty data and exit. Developers are encouraged to file a bug with the OS vendor, should they encounter an issue with this func-
tionality.
SEE ALSO
wtmp(5), shutdown(8), sync(8)
HISTORY
A reboot utility appeared in Version 6 AT&T UNIX.
BSD
June 9, 1993 BSD