Where did the RAM go ..

Mark Watts m.watts at eris.qinetiq.com
Mon Jun 28 07:45:10 CDT 2010


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.

-- 
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: This is a digitally signed message part
Url : http://lists.us.dell.com/pipermail/linux-poweredge/attachments/20100628/5dc30142/attachment-0001.sig 


More information about the Linux-PowerEdge mailing list