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Should a rp7410 be power cycled?

 
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Mike Tyrrell
Occasional Visitor

Should a rp7410 be power cycled?

I've recently been asked by my management to shutdown and power cycle my rp7410 and a K570 servers once every 3 weeks. There is no problem to be solved, he just thinks it's a good idea. What I'm looking for is something from HP that says why this should or should not take place. I would think that the stress from cycling the power would cause more problems then any good it may do. Any suggestions or comments would be helpful.
15 REPLIES 15
Alan Meyer_4
Respected Contributor

Re: Should a rp7410 be power cycled?

there is some backing to this theory, albeit thin backing. The theory is that a reboot clears up orphaned processes, semiphores and ipc registers
" I may not be certified, but I am certifiable... "
Mike Tyrrell
Occasional Visitor

Re: Should a rp7410 be power cycled?

Yes a reboot may help with this, But what about turning off the power then turning it back on. What does that do?
Thayanidhi
Honored Contributor

Re: Should a rp7410 be power cycled?

Hi,
Its always better to avoid power off/on. reboot is may acceptable once in a while!
Actually if your code is perfect (no orphened processes) then no need of any thing other than monitoring the system.

In fact "power cycling" may lead to problems. The thermal equilabrium changes in the whole system, especially disks. So there are more chances that disk fails during power cycle.
I my self have seen disk failures in several places after power cycling after a year or so.

Regds
TT
Attitude (not aptitude) determines altitude.
Leif Halvarsson_2
Honored Contributor

Re: Should a rp7410 be power cycled?

Hi,
Regulary power cycling may be common in the Windows world but not in the Unix and particulary not for HP-UX. Unless you has any specific requirement for recycling, it is not necessary.
Joseph Loo
Honored Contributor

Re: Should a rp7410 be power cycled?

hi,

u sure have a very strange management. first time i hear that the management wants a restart of server that frequent, others just go "what again! too much interruption!".

i have a few rp7410 and k380 servers which goes on for 3 to 6 months without the need to restart unless u have to do patching or kernel parameters changes.

i do not exactly agree with leif on the windows world remarks. unless on winNT, but then again, if under better system administration, server may still be well-maintained. w2k version onwards r much improved.

regards.
what you do not see does not mean you should not believe
Mahesh Kumar Malik
Honored Contributor

Re: Should a rp7410 be power cycled?

Hi Mike

I feel you should never power OFF the servers, unless a maintenance is desired. Powering OFF will disturb Thermal equilibirium and thus is more prone to electronic failures.

Rebooting is recommended to clear memory holes, zombie processes etc.

Regards
Mahesh

Re: Should a rp7410 be power cycled?

This has come up before:

http://forums2.itrc.hp.com/service/forums/questionanswer.do?threadId=901997

I guess the big question is - do you get paid overtime to come and do this out of hours? If the answer is YES, then hell, maybe once every 3 weeks isn't often enough... how about once a day!

HTH

Duncan

Accept or Kudo
Patrick Wallek
Honored Contributor

Re: Should a rp7410 be power cycled?

There is absolutely no reason to POWER CYCLE a server. It doesn't do anything but stress components.

A plain reboot is one thing, but a power cycle is totally different.

I don't power cycle unless I absolutely have to. I *HATE* actually powering off the servers. There is always a risk that some component will fail when you power the system back on.

In your case I don't see where you would gain anything.
Mike Tyrrell
Occasional Visitor

Re: Should a rp7410 be power cycled?

I agree with everyone. But does anyone know if there is any Doc from HP that may say this. I just need proof to give the management.
Alan Meyer_4
Respected Contributor

Re: Should a rp7410 be power cycled?

Lets turn this around a bit, What is the reasoning behind his request? Has he specified the benefits he expects from these power cycles?
" I may not be certified, but I am certifiable... "
Mike Tyrrell
Occasional Visitor

Re: Should a rp7410 be power cycled?

He thinks that the self tests that's done after a power cycle is better then a self test from just rebooting. He thinks that by doing this we will find hardware problems faster. This I know is not true but he still wants this done. I did check with HP about the test issue and they also said this is not true. I am running EMS on the server.
Alan Meyer_4
Respected Contributor

Re: Should a rp7410 be power cycled?

Well then, I think you are armed to the teeth for your next visit with him about it.
" I may not be certified, but I am certifiable... "
Jeff Schussele
Honored Contributor

Re: Should a rp7410 be power cycled?

Don't - EVEN - get me started.
There is NO Mr. Gates in my world.

My $0.02,
Jeff
PERSEVERANCE -- Remember, whatever does not kill you only makes you stronger!
timmy b.
Honored Contributor
Solution

Re: Should a rp7410 be power cycled?

Mike, I can't give you a document, just a "best practice" that most every IT department that I am aware of lives by as far as HPUX goes:

HP servers are designed with High Availability in mind. They are Enterprise Class servers. They are designed to run continuously for months, if not years, without being power cycled. It is not uncommon to find servers that have been running non-stop for well over a year. (Some companies don't even want to install patches because of the possibility of a reboot taking them down for a while.) Properly configured servers have event monitoring services running that will alert HP to impending failures. Keep the diagnostics up to date and make sure that Predictive or ISEE is set up and running properly.


I think a good analogy would be in order: You are driving your car down the freeway. Everything is running fine. But you decide to pull over every 10 miles to shut the engine off and then start it back up again to make sure that all the little lights on the dashboard work, the gas gauge actually moves and to calibrate the tach.

Needed? NO!

Causing unneeded stress on components? Absolutely.

And here is the one that should catch their attention: Increasing the likelyhood of an unplanned server outage? Definitely!

How much does your unplanned down time cost per hour?

Oh, and just to open up another can of worms: If they want you to be doing this, be sure that you have good backups, mirrors, and have current Ignite tapes.

If it were me, and management was insisting to me that I do this, I think I'd ask for it in writing, just in case someone further up the food chain goes looking for a head to chop off when a problem arises. There are good intentions here, but they are misguided. I'd even recommend that you get your HP CE to talk to your management.


Who is this "Gates" guy people keep talking about?

Tim (spleen now vented)
There are 10 kinds of people in this world: Those who understand Binary, and those who don't.
Brad Baron
Frequent Advisor

Re: Should a rp7410 be power cycled?

I didn't read all the threads so my apologies if this is repeated. If your drives spin all the way down there is a chance they might not spin back up. I have seen this several times after a power outage. A normal reboot is okay but no need to remove power completely. That is from experience.