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Full Discussion: Bouncing Unix Servers
Operating Systems HP-UX Bouncing Unix Servers Post 302069858 by csaunders on Wednesday 29th of March 2006 04:29:37 PM
Old 03-29-2006
Quote:
Originally Posted by rhfrommn
Where I work now we have a scheduled monthly maintenance window. On a particular Saturday we get to do whatever we need to the boxes. Everybody that uses the systems knows this and nobody works that Saturday.

Our policy is any system which hasn't been rebooted for 90 days is rebooted. Oracle servers and some Veritas Cluster Server clusters are rebooted each month instead. There are a few production boxes exempted from the policy because they support manufacturing plants which have shifts working on Saturdays.

As for the reason why - it is basically just for cleanup purposes. Stale NFS handles, zombie processes, small memory leaks from applications, etc. are all cleaned up by the reboot. Also it is a way of testing to make sure everything runs smoothly with the startup and shutdown scripts so we don't find problems with them when there is an unscheduled reboot.

I've worked other places that never rebooted machines unless it was for a specific purpose - hardware upgrades/repairs, software installs which require it, etc. It all depends on the environment and what the system admins prefer whether a scheduled reboot is appropriate or not.
good god, UNIX=NO REBOOTS, what kind of data center is this....

"Stale NFS handles, zombie processes, small memory leaks from applications, etc. are all cleaned up by the reboot"

the root cause of these should be found, not band-aided by a reboot...

you should never ever reboot unix servers unless you change the kernal or specific uprgrades require it...
 

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

NAME
reboot, halt -- stopping and restarting the system SYNOPSIS
halt [-lnq] 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. The options are as follows: -l The halt or reboot is not logged to 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. 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. SEE ALSO
wtmp(5), shutdown(8), sync(8) HISTORY
A reboot utility appeared in Version 6 AT&T UNIX. BSD
June 9, 1993 BSD
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