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Add Solution

HOST OS sees only 2.5GB RAM out of 4 or 8GB

Source: microsoft.public.virtualserver
Sent: 10/20/2006
From: (email address - cut out)
Message:

I know this might be a question best asked in another group, but since
the purpose of this box is to be the host of VS2005 R2 and since one or
more of you might have already run into this while setting up a heavy
duty box for VS hosting, I thought I'd ask here first.

I've got a Supermicro Dual-Xeon (dual core Woodcrests) with 4 to 8GB of
RAM. (I tried 8, then tried 4 when I ran into this problem).

For the benefit of the 4 extra VM licenses, I'm using Windows Server
2003 Enterprise R2 as the host. For some reason, when I have either 4
or 8GB of RAM installed, I only see 2.75GB.

I thought Enterprise could see up to 64GB of RAM.

I have a PCI-e shared memory nVidia 6200 video card and a PCI-X Adaptec
2820SA RAID controller. Otherwise there's nothing else in the system.

Any ideas on this?

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Related Messages

Re: HOST OS sees only 2.5GB RAM out of 4 or 8GB

Sent: 10/20/2006
From: Steve Jain <(email address - cut out)>
Message:

On 20 Oct 2006 00:42:45 -0700, (email address - cut out) wrote:

Are you running a 32bit OS? This sounds like the common issue with
Windows 32bit OSes and 4GB. There are dozens of hits on google about
this problem.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.

Show quoted text

>I know this might be a question best asked in another group, but since
>the purpose of this box is to be the host of VS2005 R2 and since one or
>more of you might have already run into this while setting up a heavy
>duty box for VS hosting, I thought I'd ask here first.
>
>I've got a Supermicro Dual-Xeon (dual core Woodcrests) with 4 to 8GB of
>RAM. (I tried 8, then tried 4 when I ran into this problem).
>
>For the benefit of the 4 extra VM licenses, I'm using Windows Server
>2003 Enterprise R2 as the host. For some reason, when I have either 4
>or 8GB of RAM installed, I only see 2.75GB.
>
>I thought Enterprise could see up to 64GB of RAM.
>
>I have a PCI-e shared memory nVidia 6200 video card and a PCI-X Adaptec
>2820SA RAID controller. Otherwise there's nothing else in the system.
>
>Any ideas on this?

Re: HOST OS sees only 2.5GB RAM out of 4 or 8GB

Sent: 10/20/2006
From: "Distant" <(email address - cut out)>
Message:

Hi,

you need to enable PAE mode. To do this edit the boot.ini file and add the
switch /pae to the line that has the OS.

Should look similar to this:

multi(0)disk(0)rdisk(0)partition(1)windows=(Windows Server 2003, Enterprise"
/noexecute=optout /fastdetect /PAE

This will allow your host OS to see more than 4gb memory.

<(email address - cut out)> wrote in message
news:(email address - cut out)...

Show quoted text

>I know this might be a question best asked in another group, but since
> the purpose of this box is to be the host of VS2005 R2 and since one or
> more of you might have already run into this while setting up a heavy
> duty box for VS hosting, I thought I'd ask here first.
>
> I've got a Supermicro Dual-Xeon (dual core Woodcrests) with 4 to 8GB of
> RAM. (I tried 8, then tried 4 when I ran into this problem).
>
> For the benefit of the 4 extra VM licenses, I'm using Windows Server
> 2003 Enterprise R2 as the host. For some reason, when I have either 4
> or 8GB of RAM installed, I only see 2.75GB.
>
> I thought Enterprise could see up to 64GB of RAM.
>
> I have a PCI-e shared memory nVidia 6200 video card and a PCI-X Adaptec
> 2820SA RAID controller. Otherwise there's nothing else in the system.
>
> Any ideas on this?
>

Re: HOST OS sees only 2.5GB RAM out of 4 or 8GB

Sent: 10/21/2006
From: (email address - cut out)
Message:

Yes, the /PAE switch did the trick.
Thanks Distant.

Distant wrote:

Show quoted text

> Hi,
>
> you need to enable PAE mode. To do this edit the boot.ini file and add the
> switch /pae to the line that has the OS.
>
> Should look similar to this:
>
> multi(0)disk(0)rdisk(0)partition(1)windows=(Windows Server 2003, Enterprise"
> /noexecute=optout /fastdetect /PAE
>
> This will allow your host OS to see more than 4gb memory.
>
>
> <(email address - cut out)> wrote in message
> news:(email address - cut out)...
> >I know this might be a question best asked in another group, but since
> > the purpose of this box is to be the host of VS2005 R2 and since one or
> > more of you might have already run into this while setting up a heavy
> > duty box for VS hosting, I thought I'd ask here first.
> >
> > I've got a Supermicro Dual-Xeon (dual core Woodcrests) with 4 to 8GB of
> > RAM. (I tried 8, then tried 4 when I ran into this problem).
> >
> > For the benefit of the 4 extra VM licenses, I'm using Windows Server
> > 2003 Enterprise R2 as the host. For some reason, when I have either 4
> > or 8GB of RAM installed, I only see 2.75GB.
> >
> > I thought Enterprise could see up to 64GB of RAM.
> >
> > I have a PCI-e shared memory nVidia 6200 video card and a PCI-X Adaptec
> > 2820SA RAID controller. Otherwise there's nothing else in the system.
> >
> > Any ideas on this?
> >

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