Add Memory to Red Hat VM under VMWare

Dynamically Add Memory to Red Hat VM under VMWare ESX 

1) Enable hot add memory for the VM (can only be done while VM is powered down).  This is under  Edit Settings -> Options -> Enable CPU/Memory Hotplug -> Enable Memory Hotplug

2) Add the desired memory in VMWare under Edit Settings on the shell VM

3) Run this script on the RHEL 5.x guest

#!/bin/bash

if [ "$UID" -ne "0" ]
   then
    echo -e "You must be root to run this script.\nYou can 'sudo' to get root access"
    exit 1
fi


for MEMORY in $(ls /sys/devices/system/memory/ | grep memory)
do
   SPARSEMEM_DIR="/sys/devices/system/memory/${MEMORY}"
   echo "Found sparsemem: \"${SPARSEMEM_DIR}\" ..."
   SPARSEMEM_STATE_FILE="${SPARSEMEM_DIR}/state"
   STATE=$(cat "${SPARSEMEM_STATE_FILE}" | grep -i online)
   if [ "${STATE}" == "online" ]; then
       echo -e "\t${MEMORY} already online"
   else
       echo -e "\t${MEMORY} is new memory, onlining memory ..."
       echo online > "${SPARSEMEM_STATE_FILE}"
   fi
done


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