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Upgrading a system from two pCPU to four pCPU, need RHEL reinstall?

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Operating Systems Linux Red Hat Upgrading a system from two pCPU to four pCPU, need RHEL reinstall?
# 1  
Old 05-16-2014
Upgrading a system from two pCPU to four pCPU, need RHEL reinstall?
Hello guys,
I'm running RHEL on a Cisco UCS system provided by four CPU sockets but with only two CPUs filled in (so two CPU sockets are empty).
I'd like to upgrade my system adding two other CPUs (of the same type).
Do I need to reinstall the OS after the upgrade or RHEL will seamlessly manage the new CPUs?
Has anyone experience on this?
Thanks a lot!

PS: RHEL is installed on the bare metal (no virtualisation hypervisor).
# 2  
Old 05-16-2014
No experience, but you could see if the new cpu's were 'accepted' by the current system.
Just run this before and after you add the new cpu's and compare its output:

Code:
cat /sys/devices/system/cpu/online

Though, this is not actualy showing the cpu's but the hyperthreads.

Hope this helps.
# 3  
Old 05-16-2014
My fear is that the system won't even boot, so I wonder if anyone has experience on it
# 4  
Old 05-17-2014
Assuming you are on a B or a C-series blade, your operating system will boot just fine. No re-install should be necessary.
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