RE: RAC - mix Intel and AMD in same cluster ?

Wow, this is interesting - I read the whole blog on Numa and looked for
some stuff on Metalink.  We specifically disable NUMA but use hugepages
and this info suggests that using NUMA in hardware (bios setting) and
enable Numa in Linux can benefit by 10% or more.  See Metalink note
759565.1 as well.

http://kevinclosson.wordpress.com/kevin-closson-index/oracle-on-opteron-
k8l-numa-etc/

(reposting back to Oracle Freelist as well - I edited out some
proprietary info you may not want to share)

-----Original Message-----
From: Matthew Zito [mailto:mzito@xxxxxxxxxxx] 
Sent: Thursday, July 23, 2009 5:56 PM
To: Crisler, Jon
Subject: RE: RAC - mix Intel and AMD in same cluster ?


As far as the Numa stuff goes, I personally have not worked with it, but
Kevin Closson has a great series of blog posts on the subject:

http://kevinclosson.wordpress.com/kevin-closson-index/oracle-on-opteron-
k8l-numa-etc/

He's also a generally accessible guy, so decent shot of any emailed
questions getting a response as well.

Thanks for the note,
Matt

> -----Original Message-----
> From: Crisler, Jon [mailto:Jon.Crisler@xxxxxxx]
> Sent: Thursday, July 23, 2009 5:45 PM
> To: Matthew Zito
> Subject: RE: RAC - mix Intel and AMD in same cluster ?
> 
> 
> While I am at it- have you ever played with Linux NUMA support,
> especially on HP DL Intel / AMD boxes ?  If so have you seen any
benefit
> ?
> 
> -----Original Message-----
> From: Matthew Zito [mailto:mzito@xxxxxxxxxxx]
> Sent: Thursday, July 23, 2009 5:40 PM
> To: Crisler, Jon; oracle-l
> Subject: RE: RAC - mix Intel and AMD in same cluster ?
> 
> I wouldn't know for sure if Oracle support had given us flack - but I
> probably would have heard the derisive laughter from the development
> side of the office if they had.  I think the more likely scenario that
> *could* land you in trouble is if the chipset/driver differences
between
> the two hardware architectures required a slightly different kernel
> version between the two types of boxes, Oracle support could gripe
about
> that.
> 
> But to be honest, in either situation, they'd have to notice first,
and
> for example, RAC is explicitly not supported on VMWare and we're well
> north of 100 clusters running on VMWare, and Oracle has never
> noticed/cared when supporting us.
> 
> Thanks,
> Matt
> 
> > -----Original Message-----
> > From: Crisler, Jon [mailto:Jon.Crisler@xxxxxxx]
> > Sent: Thursday, July 23, 2009 5:31 PM
> > To: Matthew Zito; oracle-l
> > Subject: RE: RAC - mix Intel and AMD in same cluster ?
> >
> > Thanks Matt !!  I always appreciate your knowledge and opinions.
Has
> > Oracle Support ever questioned you about this ?
> >
> > -----Original Message-----
> > From: Matthew Zito [mailto:mzito@xxxxxxxxxxx]
> > Sent: Thursday, July 23, 2009 5:00 PM
> > To: Crisler, Jon; oracle-l
> > Subject: RE: RAC - mix Intel and AMD in same cluster ?
> >
> > It should work fine - we have clusters here that are like that.   As
> > long as the architecture and OS match, the only difference you'll
see
> is
> > any performance differences between the two processors.
> >
> > Thanks,
> > Matt
> >
> > > -----Original Message-----
> > > From: oracle-l-bounce@xxxxxxxxxxxxx
> > [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> > > On Behalf Of Crisler, Jon
> > > Sent: Thursday, July 23, 2009 4:54 PM
> > > To: oracle-l
> > > Subject: RAC - mix Intel and AMD in same cluster ?
> > >
> > > Has anybody here built or upgraded a 10g RAC cluster using a mix
of
> > both
> > > Intel and AMD processors ?  We have an existing 3 node RAC
cluster,
> RH
> > > Linux 4 with AMD Opteron 3 ghz dual core cpu's.   It is being
> > considered
> > > to add a 4th node but with Intel CPU since the servers we used (
HP
> DL
> > > 585 G2 ) are no longer available new.   Any thoughts in mixing
Intel
> > and
> > > AMD processors in the same cluster ?  We are also looking at
> upgrading
> > > the existing processors from dual-core to quad-core, but the quads
> > seem
> > > to max out at 2.4 ghz while the duals go to at least 3.2 ghz.
> > Obviously
> > > OS and Oracle will stay same version, but we might be forced to
use
> > > Intel to add additional nodes, assuming it even works.
> > > --
> > > http://www.freelists.org/webpage/oracle-l
> > >

--
http://www.freelists.org/webpage/oracle-l


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