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тАО09-03-2005 03:23 PM
тАО09-03-2005 03:23 PM
I was told by someone that HPUX unix servers needs to be rebooted periodically. I also read that IBM AIX needs reboot periodically for better performance.
I am not sure why and when it should be rebooted. Is there any way to find out when we need to reboot the servers ?
Thanks,
Shiv
Solved! Go to Solution.
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тАО09-03-2005 03:31 PM
тАО09-03-2005 03:31 PM
Re: Periodical reboot of the servers
Sudeesh
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тАО09-03-2005 04:56 PM
тАО09-03-2005 04:56 PM
SolutionThis formula does not apply on HPUx or even on hardware supporting HPUx. I have around 30 odd HPUx PA-RISC servers and the uptime for these is listed here
*************************************
COMMAND : uptime
*************************************
10:23am up 77 days, 10:23, 6 users, load average: 0.07, 0.06, 0.05
10:23am up 49 days, 10:10, 0 users, load average: 0.11, 0.08, 0.04
10:23am up 9:26, 4 users, load average: 0.11, 0.11, 0.10
10:23am up 84 days, 23:52, 6 users, load average: 0.01, 0.01, 0.01
10:23am up 104 days, 15:35, 3 users, load average: 0.12, 0.06, 0.05
10:23am up 104 days, 15:38, 0 users, load average: 0.03, 0.04, 0.06
10:23am up 104 days, 15:38, 0 users, load average: 0.02, 0.01, 0.01
10:23am up 104 days, 15:38, 0 users, load average: 0.01, 0.02, 0.02
10:23am up 104 days, 15:38, 0 users, load average: 0.03, 0.04, 0.04
10:23am up 104 days, 15:38, 0 users, load average: 0.02, 0.03, 0.03
10:23am up 104 days, 15:38, 0 users, load average: 0.16, 0.08, 0.05
10:23am up 104 days, 15:38, 0 users, load average: 0.01, 0.01, 0.02
10:23am up 64 days, 11:23, 0 users, load average: 0.00, 0.01, 0.02
10:23am up 119 days, 10:23, 0 users, load average: 0.01, 0.03, 0.03
10:23am up 119 days, 10:16, 0 users, load average: 0.02, 0.01, 0.02
10:23am up 119 days, 10:14, 0 users, load average: 0.05, 0.03, 0.03
10:23am up 119 days, 10:14, 0 users, load average: 0.04, 0.05, 0.04
10:23am up 119 days, 10:11, 0 users, load average: 0.03, 0.04, 0.06
10:23am up 119 days, 10:10, 0 users, load average: 0.01, 0.02, 0.02
10:23am up 119 days, 10:09, 0 users, load average: 0.02, 0.03, 0.02
10:23am up 119 days, 10:09, 0 users, load average: 0.01, 0.02, 0.01
10:23am up 119 days, 10:11, 0 users, load average: 0.02, 0.02, 0.02
10:23am up 100 days, 19:01, 0 users, load average: 0.00, 0.00, 0.00
10:23am up 119 days, 9:56, 0 users, load average: 0.03, 0.03, 0.02
There has been only one or two instances during this time that application was shut that too was done manually for changes.
HTH,
Devender
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тАО09-04-2005 01:04 AM
тАО09-04-2005 01:04 AM
Re: Periodical reboot of the servers
There is no set rule for hp-ux servers to be rebooted. It depends on application environment. If there are memory leaks and number of sleeping processes are on rise, reboot is recommended.
Regards
Mahesh
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тАО09-04-2005 05:59 AM
тАО09-04-2005 05:59 AM
Re: Periodical reboot of the servers
Bill Hassell, sysadmin
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тАО09-04-2005 06:14 AM
тАО09-04-2005 06:14 AM
Re: Periodical reboot of the servers
Nothing else.
No need to do it. Since I patched once a quarter, thats how often I booted them.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО09-04-2005 08:44 AM
тАО09-04-2005 08:44 AM
Re: Periodical reboot of the servers
There is no hard rule for rebooting. The info was not true. I have servers running for more than 400 days without a reboot. All we need to do is keep monitoring it.
Example of server which is being running for the past 401 days.
4:38pm up 401 days, 7:49, 1 user, load average: 0.00, 0.01, 0.01
Regards,
Babu
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тАО09-04-2005 09:19 AM
тАО09-04-2005 09:19 AM
Re: Periodical reboot of the servers
So is reboot only option left to resolve this ?
Thanks,
Shiv
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тАО09-04-2005 09:47 AM
тАО09-04-2005 09:47 AM
Re: Periodical reboot of the servers
You may kill the sleeping processes, but may not be able to kill all the Zombie processes. To kill all zombie process we need to reboot the server.
Below is the explanation of Zombie process.
Zombie processes are created when the parent process either does not
wait on the child process, or does not ignore the child's termination
by setting the 'SIGCLD, SIG_IGN' signal within their program. Zombies
remain until the parent exits. Although zombies do not use CPU time,
they do occupy a slot in the process table.
Zombie processes are also created when a child process completes, and
sends a termination to the parent, before the parent receives the
'SIG_IGN, SIGCLD' signal to ignore the termination.
These processes cannot be killed, as they are already dead. If the
parent is killed before it exits properly, and cleans up any zombie
child processes, only a reboot will clear the zombies from the system
Regards,
Babu
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тАО09-04-2005 10:51 AM
тАО09-04-2005 10:51 AM
Re: Periodical reboot of the servers
HP-UX boxes are typically up for months without reboot and the only time they should be rebooted is for periodic patchset installation.