Server having 16GB Memory but displays only 8GB on xen Linux

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Issue

Server having 16GB Memory but displays only 8GB on xen Linux machine

Environment

Kernel : 2.6.18-194.26.1.el5xen #1 SMP
Supported Architecture : x86_64 x86_64 x86_64
OS : Red Hat Enterprise Linux Server release 5.5 (Tikanga)

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