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Full Discussion: update w/o reboot
Operating Systems AIX update w/o reboot Post 302219783 by shockneck on Wednesday 30th of July 2008 03:55:07 AM
Old 07-30-2008
Quote:
Originally Posted by itik
[...] The apar instructions is to reboot on the ibm site. Is there's a way to update apar w/o reboot? I think I heard something before that it's possible.[...]
As long as you don't want to use the changed feature that comes with such an APAR which requires a reboot you don't have to reboot. I am not aware of any os update that would force you to reboot immediately. However if you want to use the updated kernel you will have to reboot.

Mind also that if you don't reboot the patched kernel on disk is not the same as the kernel in memory. Hence some things won't work. E.g it might be impossible to do any io or vm tuning till you reboot and you might get strange/silly error messages.
 

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reboot(8)						      System Manager's Manual							 reboot(8)

NAME
reboot - Restarts the machine SYNOPSIS
/usr/sbin/reboot [-dlnq] DESCRIPTION
When the system is running and multiple users are logged in, use the shutdown -r command to perform a reboot operation. If no users are logged in, use the reboot command. The reboot command normally stops all running processes, syncs the disks, logs the reboot, and writes a shutdown entry in the login accounting file, /var/adm/wtmp. The reboot command uses the sync call to synchronize the disks, and to perform other shutdown activities such as resynchronizing the hard- ware time-of-day clock. After these activities, the system reboots. By default, the system starts and the file systems are automatically checked. If the start-up activities are successful, the system comes up in the default run-level. You must have root privileges to use this command. Using the -n flag can result in file system damage. FLAGS
Generates a crash dump of the system before halting it. Can be used with any of the other flags. Does not log the reboot using syslog Does not sync the disks or log the reboot using syslog Performs a quick reboot without first shutting down running processes; does not log the reboot using syslog EXAMPLES
To enable the default reboot action, enter: reboot This command causes the system to stop all running processes, sync the disks, log the shutdown, and perform other routine shutdown and reboot activities. To shut down the system without logging the reboot, enter: reboot -l This command shuts down the system and performs all shutdown and reboot activities, except logging the shutdown. To reboot the system abruptly, enter: reboot -q This command reboots the system abruptly without shutting down running processes. FILES
Specifies the command path Specifies the login accounting file Specifies the path of the syslog daemon RELATED INFORMATION
Commands: fsck(8), halt(8), init(8), savecore(8) shutdown(8), syslogd(8) Functions: reboot(2), sync(2), syslog(3) delim off reboot(8)
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