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Old 01-26-2008, 10:14 AM   #1
natediggs
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Not all memory recognized


Hi Everyone--

I'm a Widnows Server 2003 administrator and I'm evaluating Red Hat Linux 5 to see if switching some of our servers to it would lower our TCO. So far the evaluation is going well but I've run into a few issues I can't seem to figure out. The most frustrating is... The server I'm evaluating it on is an HP Proliant with 8GBs of memory. For some reason the system reports that it only has 3GBs of memory when it should have 8. I have evaluated both Suse Enterprise 10 and Red Hat 5 and both versions have the same issue. I'm new to this linux stuff but I think there must be some kind of kernal module that I need to enable to support as much memory as the system has. Anybody have any ideas? It is an AMD64 system and I'm using the 64bit version of the OS but still no luck.

Thanks for any help taht is offered and let me know if you need any more information.
 
Old 01-26-2008, 10:43 AM   #2
natediggs
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I have another problem.... The server I'm configuring has a Dell SP1908 monitor. I am unable to set the resolution of the monitor to 1280x1024 which is it's native resolution. If I set it for 1024x768 then the bottom of the screen displays random pixels. Anyone know a resolution for eitehr of these problems? I've tried changing the display settings and choosing a new monitor but it still won't let me crank up the resolution.
 
Old 01-26-2008, 11:16 AM   #3
reddazz
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Hi and welcome to LQ.

For issues with memory, you need to install a kernel that supports more than 4GB or RAM. The kernel should be called kernel-PAE and you can install it as root using yum e.g.
Code:
#yum install kernel-PAE
You will need to reboot and select this particular kernel from the bootloader screen. An alternative would be to edit /boot/grub/menu.lst and make it your default kernel.

For the monitor issue, have you tried configuring it as a generic monitor that suppoorts the resolution you wish to use?

Last edited by reddazz; 01-26-2008 at 11:18 AM.
 
Old 01-26-2008, 11:28 AM   #4
natediggs
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Thanks for the response. I tried to install the kernal you mentioned and Red Hat is unable to locate it both using Yum from the command line and from the "Package Manager." Do I have to do anything to setup repositories for add on packages?

As for the monitor, yes I have tried to set it up as a generic monitor using the resolution I want.
 
Old 01-26-2008, 11:28 AM   #5
lazlow
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reddazz

With the 64bit version he should not need PAE(only for 32bit).

Nate

How are you determining how much memory Linux is reporting? Since Linux handles memory different than windows many have problems with this.
 
Old 01-26-2008, 11:37 AM   #6
natediggs
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If I go to the System Monitor and look at the Memory and Swap history it only shows 3GBs of "user memory." Is there another way to determine how much system memory is available? Also if I go to the Virtual Machine Manager and look at the main machine it shows that I'm using 91% of the 3.19GBs available. Thanks a lot for the help guys.
 
Old 01-26-2008, 11:37 AM   #7
reddazz
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Quote:
Originally Posted by lazlow View Post
reddazz

With the 64bit version he should not need PAE(only for 32bit).

Nate

How are you determining how much memory Linux is reporting? Since Linux handles memory different than windows many have problems with this.
Oops, I completely missed the part where he said he is running a 64 bit distro. I've also been thinking, if this machine has a valid Red Hat subscription, it probably would be best to contact the people at Red Hat and they may help with the problem.
 
Old 01-26-2008, 11:41 AM   #8
natediggs
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Yeah, I would do that but I'm using an Evaluation subscription right now and that doesn't include any "support" just updates and access to the Knowledge Base. I've also evaluated Suse and Red Hat is overall leaps and bounds better then Suse but I'd like to figure this stuff out before I commit to running Linux at all.
 
Old 01-26-2008, 11:53 AM   #9
lazlow
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Nate

You were looking in (one of) the right place. You can also open a terminal, enter "free" or "top" and get information. For pretty much any command you can "man" command and get a pretty good manual of the command.

I would look through the bios settings and see how they are set (basically play around). There is a "window" setting for memory at the to of 4gb that can cause issues. The other thing is to check the bios version. Many times things like this will clear up after a bios update.

On the software side: Centos is RedHat EL with the logos removed(free to download). It runs the same binaries as RHEL which is why you often see rpms market el5 (for RHEL5 or Centos5). I would go over to the Centos forum and post there too. This will double your chances of getting help. The problem you are going to run into is that most of us are using "mainstream" motherboards, which until recently were limited to 4gb. This limits the experience pool considerably.
 
Old 01-26-2008, 12:37 PM   #10
natediggs
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Thanks for the help lazlow, I have posted my issues over on the centos boards. If there is anything anyone else can think of I'd appreciate the help. I just updated the BIOS with no luck.
 
  


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