Where did the RAM go ..

Nick Lunt nick.lunt at patech-solutions.com
Mon Jun 28 07:42:07 CDT 2010


Hi Mark

> -----Original Message-----
> From: Mark Watts [mailto:m.watts at eris.qinetiq.com]
> Sent: 28 June 2010 13:45
> To: Nick Lunt
> Cc: linux-poweredge at dell.com
> Subject: Re: Where did the RAM go ..
> 
> On Mon, 2010-06-28 at 13:09 +0100, Nick Lunt wrote:
> > Hi folks
> >
> > R900 running RHEL5.
> >
> > This weekend we moved up to 128GB RAM. However I'm confused with the
> > outputs given.
> >
> > The server has 32 x 4096MB DIMM's, giving a total of 131072MB, which
> > is 128GB.
> >
> > omreport shows the following:
> >
> > Total of Memory Array(s)
> >
> > Attributes : Total Installed Capacity
> >
> > Value      : 131072  MB  -- 128GB. Spot on, just what I expect
> >
> > Attributes : Total Installed Capacity Available to the OS
> >
> > Value      : 128868  MB  -- 125GB. So where did the rest go ?
> >
> > # free -m
> >
> >                    total          used            free     shared
> > buffers     cached
> >
> > Mem:        128869     128245        623          0        659
> > 49701
> >
> > -/+ buffers/cache:      77885      50984
> >
> > Swap:        16383         92      16291
> >
> > So where did 3GB disappear to ?
> >
> > Many thanks,
> >
> 
> Is this a 32bit PAE kernel, or x86-64 kernel?
> 
> I have recollections of 32bit kernels using the space below 4GB for PCI
> devices.
> 
> Mark.

64 Bit server -

# arch
x86_64
# uname -r
2.6.18-92.el5

Thanks
Nick.
 

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