From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Wed Jul 03 2002 - 13:42:19 EDT
Thanks; I did what I should have done in the first place: RTFM.
Apparently, in a cluster situation if you don't have the 128MB DRAM you
can't take full advantage of the Fast-Write cache and it'll only use 16MB
instead of the full 32MB. Since what we really want is the FWC, we better
cough up the money for the SDRAM as well.
Simon Green
Philip Morris ITSC Europe
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> -----Original Message-----
> From: Raj Atwal [mailto:tatwal@YAHOO.COM]
> Sent: 03 July 2002 18:29
> To: aix-l@Princeton.EDU
> Subject: Re: IBM 6230 SSA Adapter DRAM
>
>
> According to the technical reference guide for that
> adapter, increasing the DRAM from 64MB to 128MB on a
> RS/6000 or SP makes available "support for full 32mb
> write cache in a 2-way cluster".
>
> So I guess you should see some performance gain,
> although how much I am unsure.
>
>
>
> --- "Green, Simon" <SGreen@KRAFTEUROPE.COM> wrote:
> > What is the effect of increasing DRAM on the 6230
> > from 64 to 128MB?
> >
> > This will be in an HACMP cluster with six adapters
> > in each server and twelve
> > separate loops, (so one adapter from each server in
> > each loop).
> >
> > We'll also be getting fast-write cache.
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