Max CPUs on RHEL 4 (x86_64 or i686)?

Hello,

I'm working on building a very robust database server, and
was wondering what the default max CPU count for RHEL 4 is. 
Does anyone have a link or details for that?  I'm looking
for something in the x86_64 or i686 class (ia64 supports up
to 1024 processors!!).  I know I can use the HUGEMEM or SMP
kernels to get multiprocessor support, but I don't know what
the max is.

Thanks,
Mike.

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http://www.redhat
.com/rhel/compare/


Young, Mike wrote:
> Hello,
> 
> I'm working on building a very robust database server,
and was wondering what the default max CPU count for RHEL 4
is.  Does anyone have a link or details for that?  I'm
looking for something in the x86_64 or i686 class (ia64
supports up to 1024 processors!!).  I know I can use the
HUGEMEM or SMP kernels to get multiprocessor support, but I
don't know what the max is.
> 
> Thanks,
> Mike.
> 

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Troy Knabe wrote:
> http://www.redhat
.com/rhel/compare/
> 

The actaul limits pages too:

http://www
.redhat.com/rhel/details/limits/


Regards,
Michael
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On 2/20/07, Mike Kearey <mkeareyredhat.com> wrote:
>
> The actaul limits pages too:
>
> http://www
.redhat.com/rhel/details/limits/

Are these limits defined by what configurations Red Hat
supports
through its various support options or by what RHEL
supports?

John

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On 2/20/07, Mike Kearey <mkeareyredhat.com> wrote:
> inode0 wrote:
> > On 2/20/07, Mike Kearey <mkeareyredhat.com> wrote:
> >>
> >> The actaul limits pages too:
> >>
> >> http://www
.redhat.com/rhel/details/limits/
> >
> > Are these limits defined by what configurations
Red Hat supports
> > through its various support options or by what
RHEL supports?
> >
> > John
> >
>
> Hi John. I anticipated there would be a question like
this 
>
> In the page you will have noticed a section
"Support limits as defined
> by Red Hat Enterprise Linux Product Subscription"
>
> This section defines what is actively support for each
product. Think of
> this as 'the limits RH GSS will can assist you in
reaching'. For
> example, if you have a RHEL 4 ES system we can assist
you in reaching
> the supported limits of 2 CPU'S.
>
>
>
> You will also notice that there is also a
"Technology limits
> (certified[/theoretical])" section. For AS the
"Support limits as
> defined by Red Hat Enterprise Linux Product
Subscription" has mainly a
> dash '-' . This means the supported limits are
undefined. Think of this
> as 'we can assist you in reaching the
certified[/theoretical] technology
> limits listed'.

Michael,

Thanks for pointing that out, I'm embarrassed to say I did
not notice
the difference between the sections that you just pointed
out to me. I
am frequently asked about the difference between AS and ES
and think
my understanding was just confirmed. I work in one of those
site
subscription sorts of places.

Thanks,
John

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On 2/20/07, Mike Kearey <mkeareyredhat.com> wrote:
> No problem John. Note that there are real differences
in the pckages for
> AS compared to ES.
>
> The most significant is that RHEL4 AS has a largesmp
kernel specifically
> optimized for big iron. The ES variant does not have
that.

Every time you open your mouth I learn something new. I
glanced at the
base package lists and didn't see any obvious difference
between the
two. On the not too big iron around here I hadn't noticed
any problems
with using either flavor. How big does the big iron need to
be before
the benefits of the largesmp support kicks in?

Thanks,
John

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On Tue, 20 Feb 2007, inode0 wrote:
> Every time you open your mouth I learn something new. I
glanced at the
> base package lists and didn't see any obvious
difference between the
> two. On the not too big iron around here I hadn't
noticed any problems
> with using either flavor. How big does the big iron
need to be before
> the benefits of the largesmp support kicks in?

Or, on a similar note, does running AS on "small
iron" have any 
detrimental effects that would be "fixed" by
running ES?


-- 
Jeremy L. Gaddis, MCP, GCWN             jeremylinuxwiz.net
LinuxWiz Consulting                     http://linuxwiz.net


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