[CentOS] Server hangs on CentOS 5.5

Brunner, Brian T. BBrunner at gai-tronics.com
Wed Mar 9 15:55:12 UTC 2011

centos-bounces at centos.org wrote:
> On Wednesday, March 09, 2011 10:16:34 am Brunner, Brian T. wrote:
>> This would be far cheaper than the time spent troubleshooting the
>> running (sometimes hanging) system.
> Let me interject here, that from a budgeting standpoint
> 'cheaper' has to be interpreted in the context of which
> budget the costs are coming out of.  

This degenerates into "Your dollars are cheaper than my dollars".

> New hardware is capex,
> and thus would come out of the capital budget, and admin time
> is opex, and thus would come out of the operating budget.

This is where mental ossification amongst bean-counters can kill a
"Economic Opportunity Cost" should raise its head here: What would we do
with the $capex if we paid $opex vs what would we do with the $opex if
we paid $capex.  "The Time Value of Money vs The Money Value of Time" is
another phrasing of this point-of-view.  Unfortunately this is no longer
a CentOS topic.

>> Starting with RAM and Power Supply is not random ... They're "The
>> Usual Suspects".
> This is a very true statement.
> Heat and airflow are two others.

RAM and PowerSupply are easy starting points: swap RAM between two
systems and see (in the next 3 months) if the problem moved,  swapping
power supplies is a bit trickier but doable if the systems are similar
enough.  Again, several months watching to see where the problem
manifests is a test of patience and diligence.  It's possible that doing
this will make the problem stop arising (RAM and PS are both good
enough, they just don't play well together).

Heat & airflow are harder to swap (says the guy who opened an office
desktop, and vacuumed out enough hair, lint, dust, dander, and ashes to
knit a grey angora hamster (with lung cancer)).

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