Upgrading Windows server 2008 to 2012 R2 with SQL server 2012 installed

I have a copy of windows server 2012 R2 with 32gb of ram installed.

On this machine is a virtual machine with Windows Server 2008 R2 standard running SQL server 2012 with 28gb of ram. When we first started using SQL it was a small project, and has grown and now the server needs more ram.

Is it possible to do an in place upgrade of the OS to 2012 so that it supports more than 32gb of ram?
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Salah Eddine ELMRABETTechnical Lead Manager (Owner)Commented:

Why you want to use virtual machine inside the Win2012 physical machine since you need to use all avalable memory on the physical machine??

Best Regards.

CaptainGibletsAuthor Commented:
We virtualise every server possible, just makes it easier for recovery scenarios etc and if we have to move the server if it outgrows the hardware etc. Its irrelevant anyway as SQL is on 2008 R2. So I will either need to do an in place upgrade or a migration to another server. Just looking to see if anyone has any experience with the first option.
Cliff GaliherCommented:
In general because of .Net dependencies in SQL, I do not recommend in-place upgrades for those workloads. If you have kept up with patches at all, current .Net 3.5 revisions are newer than even the newest 2012 R2 media. So by trying to do an in-place upgrade, some .Net code gets the media versions while other bits remain patched. This makes a reliable WU/WSUS scan less likely and introduces some stability issues. Better to migrate (in the real world) at this time.

Luckily, so far, win10 looks to finally solve this issue if trends continue as they have when released.

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Windows Server 2012

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