Home » Server Options » RAC & Failsafe » Scale up vs Scale out
Scale up vs Scale out [message #271210] Sun, 30 September 2007 19:42 Go to next message
seethem
Messages: 41
Registered: September 2007
Member
Currently we are running -->
* 2-node Oracle RAC 10gR2 (10.2.0.3.0) on AIX.
* 16G 2CPU Dual core per node (IBM p550)
* 6.5GB of memory is allocated to the (SGA + PGA) per node out of the 16G.

FACTS
=======

* IBM Tivoli Monitoring (ITM) tool continually show O/S memory and CPU being highly utilized. I am not too worried about the CPU averaging about 70-80% utilized.

At this point management is basically interested in scaling each node up as opposed to scaling out.

QUESTIONS
===========

Can you suggest areas to look for or things that the dba team can do to propose what the current memory or CPU state should be?

I am only interested in providing facts that would answer "the why we should scale up?" question.

Many thanks, in advance.
Re: Scale up vs Scale out [message #271370 is a reply to message #271210] Mon, 01 October 2007 08:04 Go to previous messageGo to next message
Frank Naude
Messages: 4420
Registered: April 1998
Senior Member
Well, both methods (scale up & scale out) should solve your performance/capacity problem.

Some of the reasons why they might prefer to scale up:

* Not enough floor space to accommodate more servers
* Prefer managing fewer servers (less work)
* Cheaper - only buy the components (no need to buy another chassis)
* Interconnect already saturated
Etc.
Re: Scale up vs Scale out [message #271905 is a reply to message #271210] Wed, 03 October 2007 06:15 Go to previous message
seethem
Messages: 41
Registered: September 2007
Member
Hi Frank,

What can I do to quantify the scaling up?
What can I get to say -- because the load is this, you need to get X GB more of RAM or Y CPUs more

Is there a study that can point me in the right direction that would say, if x,y,z are happening, chances are that your system is overloaded.

Thanks for your advise and patience.
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