netware 5.1 periodic cpu spikes

n...@cop.ufl.edu

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Dec 22, 2006, 12:56:20 AM12/22/06

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starting on dec 9 for no obvious reason, one of my netware 5.1 servers
started spiking cpu utilization every 10 to 15 seconds. the health
monitor shows all green lights.

Andrew C Taubman

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Dec 26, 2006, 6:09:17 PM12/26/06

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Next time it happens, look in

Monitor - kernel - threads, and
NRM - profile/debug - Profile CPU execution by NLM

to see what is causing the high util.
--
Andrew C Taubman
Novell Support Forums Volunteer SysOp
http://support.novell.com/forums
(Sorry, support is not provided via e-mail)

Opinions expressed above are not
necessarily those of Novell Inc.

n...@cop.ufl.edu

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Dec 29, 2006, 5:23:27 PM12/29/06

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the top two threads are always "server" with interrupt counts in the
millions and all others in the thousands

Andrew C Taubman

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Jan 7, 2007, 5:30:52 PM1/7/07

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That's in Monitor? You need to drill down in NRM and see what those
threads are actually doing.

n...@cop.ufl.edu

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Jan 8, 2007, 9:39:31 AM1/8/07

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I used debugging and profiling in the web portal (this is nw51 sp2a).

It shows AIOCOMX using almost all the cpu time.

Andrew C Taubman

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Jan 8, 2007, 5:09:54 PM1/8/07

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That's a serial port. Do you have a UPS or any other device connected to
that?

n...@cop.ufl.edu

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Jan 20, 2007, 5:13:06 PM1/20/07

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The very first thing I tried was to unload pwrchute, aio, and aiocomx
but the cpu spikes continued.

Andrew C Taubman

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Jan 21, 2007, 5:07:12 PM1/21/07

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Oooooookay, so what is showing as using the CPU when all those are unloaded?

n...@cop.ufl.edu

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Jan 22, 2007, 9:40:26 AM1/22/07

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i have a cputrace utility. with the pwrchute nlm's unloaded, whenever
cputrace shows a cpu spike, the nlm than was running is ds.nlm .

Andrew C Taubman

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Jan 22, 2007, 5:07:42 PM1/22/07

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So it could simply be a DS sync?

BTW is this causing you any actual operational problem?

I suggest you apply nw51sp8 and nw51os8a. If and only if the spikes
continue, please download fconfig15.exe from the file finder at
support.novell.com. Extract Config.nlm from it and copy that to SYS:SYSTEM .

On the console do LOAD CONFIG /jumba1se, and wait until the output file
CONFIG.TXT gets created (on NW 6.x this message only appears on the
Logger screen). Please post that file here, with any public IP addresses
and RConsole passwords edited out. Thank you.

n...@cop.ufl.edu

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Jan 24, 2007, 12:52:35 PM1/24/07

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On Jan 22, 5:07 pm, Andrew C Taubman

<ataubman.RemoveThisToMai...@novell.AndThis.com> wrote:
> So it could simply be a DS sync?

there are three servers in the tree. only one is spiking.

> BTW is this causing you any actual operational problem?

something is making the backups slower. that's how i noticed the
problem in the first place.

Andrew C Taubman

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Jan 24, 2007, 5:29:17 PM1/24/07

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Backups speeds are almost entirely determined by the network and disk
channel, CPU is extremely unlikely to be anything to do with backup speeds.