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Homework and Emergencies Emergency UNIX and Linux Support Different OS Kernel Update Frequency Post 302555819 by pludi on Thursday 15th of September 2011 05:07:52 PM
Old 09-15-2011
Disclaimer: I can only attest for the Linux side of things here.

First of all, 3 to 6 months isn't that long of an uptime, as I've seen systems with 2+ years. And with the distributions you've listed there won't be any major kernel updates in that time, save important security updates, and even those don't force a reboot (but the new kernel will only be used after a reboot). If you really need high availability, better to look into proper redundancy by setting up a cluster, where a second node can easily take over should the primary suffer a hardware defect.
 

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

NAME
reboot - reboot the system immediately SYNOPSIS
reboot [-f] DESCRIPTION
Reboot can be used to reboot the system after installing a new kernel. It does not inform the users, but does log it's actions in /usr/adm/wtmp and /usr/adm/authlog. The system is then rebooted with the reboot(2) systemcall. If the -f flag is not given then all processes are sent terminate signals to give them a chance to die peacefully before the reboot() call. If the wtmp file exists, reboot logs itself as if it were a shutdown. This is done to prevent last(1) from talking about system-crashes. Reboot is registered as is in the authlog file. Reboot can only be executed by the super-user. Any other caller will be refused, either by reboot(8) or by reboot(2). SEE ALSO
reboot(2), shutdown(8), halt(8), boot(8). BUGS
The error message's given by reboot are not always useful. There are several routines that can fail, but which are not fatal for the pro- gram. AUTHOR
Edvard Tuinder (v892231@si.hhs.NL) REBOOT(8)

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