Windows Server 2012 R2 not detecting 2nd CPU properly

Hi guys,

I have yet another server problem

I've got a HP ML350 G5 with 2 x E5310 Xeons in it. It used to run OpenSUSE where all 8 cores worked without a hitch, but now we need it to run Server 2012 R2.

It all works fine except task manager only shows one CPU (4 cores). Device manager lists all 8 cores in the processor section but given the performance we're getting I'm inclined to believe task manager.

Any ideas guys?

 

Never mind, we're going back to OpenSUSE.

However, it would seem to be HAL type related.

 

MSconfig > boot > advanced options, showing number of processors as 2 ?
Intel drivers installed ?

 

Showed as auto and yes all drivers up to date.

Set it to 2 now. Will see if that helps.

 

Nope. Just got 2 cores now. Back to opensuse grr

 

What version of 2012 is it?
Is the RAM correctly configured (RAM split between the 2 CPU's)

 

Don't you need additional licences for dual CPU's?

 

As long as it's not foundation or essentials it should see 64 sockets out of the box

 

Apparently only the Foundation edition limits to one CPU. But if that's the edition you're using, then that's your problem.

 

Not its standard. I've loaded it numerous times tries every setting I can think of and it still oonly has 4 cores

 

Stupid question but have you checked the view settings in task manager?

 

Haha Pookie lol yes I did. 8 cores detected in device manager. 4 cores everywhere else. I might try the evaluation for the datacenter edition see if that fairs any better.

 

Ok, an update.

My issue is caused by installing Hyper-V. Install it and restart, 2nd CPU disappears. Remove and restart, 2nd CPU reappears.

Is it meant to do this? If so, how do I monitor core usage for the "missing" CPU?

 

Would it be because the E5310 doesn't support VT-x with Extended Page Tables (EPT), also known as Second Level Address Translation (SLAT) ?

 

Second-level address translation (SLAT) support is optional, but desirable if you have memory-intensive workloads.

Hardware wise for Hyper-V, the CPU absolutely must support Data Execution Prevention and hardware virtualization and those features must be enabled.

Here's the HP guide for enabling hyper-v, it's for Server 2008 but will still be valid for 2012:
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01516156/c01516156.pdf

 

Thanks Atomic but I've already set the relevant options in BIOS.

 

Hello noizdaemon666
I have exactly the same issue with a HP ML350 G5 and 2 x E5320 Xeons.
To verify I removed Hyper-V and voila: taskmanager shows both processors ...

Do you have any information for me how to solve it?
Or is the second CPU used by the OS although taskmanager doesn't show it?

Thanks in advance,
Andy

 

Licencing. Do you have a licence which will allow you 2 CPUs with Hyper V enabled?

 

The license card shows: Windows Svr Std 2012 R2 x64
2CPU/2VM
This should be sufficient, shouldn't it?

 

Sorry, nobody any idea?