HotAdd on VM

We have upgraded the esx environment from 4.1 to 5.1. My understanding is that esx5.1 supports hotadd. Some reason, my vm CPU and memory are grayed out when I try to add CPU or expand the memory. I am unable to add these while the VM is running?
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Haresh NikumbhConnect With a Mentor Sr. Tech leadCommented:

can you help me to understand on what basis you have given point to bluedan?

bluedan is correct hot add support only few os, but the main question was your VM CPU and Memory is grayout and you asked how to make it available for hot add and hot plug.
Haresh NikumbhSr. Tech leadCommented:
Poweroff VM

In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.

Click the Options tab and under Advanced, select Memory/CPU Hotplug.

Enable or disable memory hot add.

Click OK to save your changes and close the dialog box.

also verify if your guest OS is support hotadd on option

sara2000Author Commented:
so you have to power down it to enable? I have 100VMs
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Haresh NikumbhConnect With a Mentor Sr. Tech leadCommented:
yep,  even you can enable this feature via power-cli but reboot is still required
bluedanConnect With a Mentor Commented:
You need to make sure the guest os is also support Hot-add as per expert mentioned above.

For example,

Windows 2008 R2 standard does not support hot add.

Hot add memory is supported by Windows 2008 R2 Enterprise Edition
Hot add memory and CPU is supppred by Windows 2008 R2 Datacenter Edition, and Windows 2012

Hope this help.
sara2000Author Commented:
I am waiting for down time .
if Bluedan is correct then I do not need to try becuase I do not have windows 2008 ent.
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