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03.27.2008 at 05:37PM PDT, ID: 23276153
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Autorestart script in AIX
Hey,

I am looking to automatically restart an AIX Server onces a week.  Can anyone point me in the right direction with some documentation on how to create a script to do this job?
Any help would be appreciated.

Thank you.
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Question Stats
Zone: OS
Question Asked By: cbones
Solution Provided By: tsgorski
Participating Experts: 3
Solution Grade: A
Views: 4
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03.27.2008 at 06:03PM PDT, ID: 21227171

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03.28.2008 at 04:34AM PDT, ID: 21229391

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03.29.2008 at 07:19PM PDT, ID: 21239270

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03.31.2008 at 07:27AM PDT, ID: 21245642

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03.31.2008 at 01:03PM PDT, ID: 21248632

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03.31.2008 at 01:04PM PDT, ID: 21248648

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03.27.2008 at 06:03PM PDT, ID: 21227171
If you do not have any applications to worry about shutting down gracefully (meaning you can just reboot the server), then you can just do something as simple as this...(assuming root authority)

#!/usr/bin/ksh
shutdown -F -r  <-- the -F is for force, the -r is for reboot

Don't forget to change your permissions on the new script file so it can be executed
chmod 550 reboot.ksh

Call the script reboot.ksh in the crontab...
crontab -e  <--gets you into edit mode for the crontab

Then page down to the bottom and put your job in...
00 01 * * 0 /some/directory/reboot.ksh  <---this would call your script to kick off at 1am on sundays for example


If you have applications that need to be stopped first, you may need to build something a little more complex.


Accepted Solution
 
03.28.2008 at 04:34AM PDT, ID: 21229391
To reboot at 1am on sundays adding the following line to the root crontab will do just fine:

00 01 * * 0 /usr/sbin/shutdown -Fr
Assisted Solution
 
03.29.2008 at 07:19PM PDT, ID: 21239270
Thank you for the responses.  When you reboot the server it prompts you with a question.  It says to prompt "y" for the reboot.  How can I add that in?


Thank you.
 
03.31.2008 at 07:27AM PDT, ID: 21245642
Looks like an alias (-i) for that command. Default is no confirmation. Check with alias.
 
03.31.2008 at 01:03PM PDT, ID: 21248632

Rank: Guru

Do not restart your AIX every week.
AIX does mirror read-only RAM pages to swap space after they have been read-only for a week. This puts high i/o waits after a week system has been up. (and system is unresponsive and uptime shows something highly above 10 due to lots of applications waiting for highest-priority swapping to complete and do their IO requests)

vmtune -f 10000 -F 12800

will keep ~40MB of ram free and do swap in larger blocks so that IO waits are not that heavy.

Another lifesaver is launching some memory-consuming application, like pico against huge log file and exitting it. That will cause lot of memory to be paged out and leave free breathing space afterwards.

There are two swap allocation rules:
1) if there is one disk then double the RAM size
2) if there are many disks - RAM-size on every disk.

Assisted Solution
 
03.31.2008 at 01:04PM PDT, ID: 21248648

Rank: Guru

Parameter you tune using vmtune has defaults of 100 and 128 , and this "free" space is used for disk readaheads, kernel driver allocations and libc allocations. Best if it never runs empty.
 
 
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