Where did the RAM go ..

Nick Lunt nick.lunt at patech-solutions.com
Mon Jun 28 07:09:00 CDT 2010

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

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
-/+ buffers/cache:      77885      50984
Swap:        16383         92      16291

So where did 3GB disappear to ?

Many thanks,


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