topic Hot add/remove cpu/memory for windows 2008/2012 in BladeSystem - General

Hot add/remove cpu/memory for windows 2008/2012

chuckk281 — Tue, 02 Jul 2013 14:38:21 GMT

Request from Dejan:

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Does somebody have latest official tables with support for hot add/remove cpu/memory per version of windows and linux as VM.

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Reply from Adam:

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For VMware 5.1, the compatibility guide has a list of which OS’s VMware support. (http://partnerweb.vmware.com/comp_guide2/pdf/VMware_GOS_Compatibility_Guide.pdf) Look for hot-add memory and hot-add vCPU.

For Hyper-V only Hot-Add of memory is supported (I think) I’m afraid I don’t know which guest-OS’s are supported with this feature though.

I don’t think ‘hot remove’ of memory or CPU is supported on vmware or on hyper-V.

For the guest OS’s I don’t think hot-remove support is quite there on physical hw either.

Linux kernel patches seem to be going through now that look at hot-remove of memory and CPU, but they are very new.

I believe that Red-Hat can support logical removal of memory and CPU but not yet physical, but I don’t know how that would translate into the virtual world.

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Any other help?

Re: Hot add/remove cpu/memory for windows 2008/2012

Ing-Syst — Wed, 31 Jul 2013 19:28:18 GMT

As far as I see, ESXi doesn't support hot remove CPU/RAM for Windows Server.

Re: Hot add/remove cpu/memory for windows 2008/2012

apspraba — Tue, 15 Sep 2015 09:46:13 GMT

Hot Add CUP/Memory supported in windows 2008 R2(only Datacenter Edition), Hot add CPU is the ability to dynamically add CPUs to a running system. Adding CPUs can occur physically by adding new hardware, logically by online hardware partitioning, or virtually through a virtualization layer. Starting with SQL Server 2008, SQL Server supports hot add CPU.

Requirements for hot add CPU:

Requires hardware that supports hot add CPU.
Requires the 64-bit edition of Windows Server 2008 Datacenter or the Windows Server 2008 Enterprise Edition for Itanium-Based Systems operating system.
Requires SQL Server Enterprise.
SQL Server cannot be configured to use soft NUMA.