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Re: Managing CPU_COUNT for micro-partitioning on AIX

From: Alex Gorbachev <>
Date: Tue, 4 Jul 2006 14:54:27 +0200
Message-ID: <>

The same way on HP Superdomes and we never had problems with that. I guess the only thing is that Oracle must be linked correctly in the beginning. For Linux, I think that should be using SMP kernel.

2006/7/4, Allen, Brandon <>:
> We're running on AIX 5.3 with LPARs and my Unix admins threw in a
> few extra tenths of a CPU in our production environment without even giving
> me any advanced notice, which I wasn't too happy about considering we hadn't
> even tested it, but Oracle seemed to handle it without any problems and
> cpu_count magically went up from 8 to 10. Honestly, I'm not even sure how
> many tenths of physical CPUs I'm running on. All I know is what it looks
> like according to topas, vmstat, sar and Oracle, which are all in agreement
> that there were 8, and are now 10, virtual/logical CPUs, but I don't really
> know exactly how it's configured behind the scenes other than that there are
> really only 4 multi-core CPUs in the box. My Unix admins like to keep me in
> the dark as much as possible so I don't ask too many questions. You'll
> notice when you run the AIX 5.3 performance utilities there are metrics
> called ent and entc% or something like that - can't remember for sure off
> the top of my head, but these represent the number of virtual CPUs your LPAR
> is entitled to, and the % of your entitlement you are consuming.
> Regards,
> Brandon
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Best regards,
Alex Gorbachev
Received on Tue Jul 04 2006 - 07:54:27 CDT

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