Re: Max amount of RAM in 7.2 question

[Nick Lindsell]

At 10:18 21/01/2003 -0500, you wrote:

Greetings -

I've scoured Google and redhat.com most of the morning for a specific
answer, but haven't found it.  Hopefully someone here will have it.

I have a Compaq ProLiant server with RH 7.2 SMP (2.4.9-31smp kernel).  Up
until this morning, it had 1.25 GB of RAM.  This morning I installed 6 GB
RAM, replacing the existing 1.25 GB.  The hardware supports 6 GB, and 6 GB
shows up fine in the BIOS POST.

However, dmesg, /proc/meminfo, and "free -m" shows that only 4 GB was picked
up when the server was restarted.

Is 4 GB a hard maximum limit for 7.2?  Is there a hard maximum limit, and if
so, what is it?

The memory limit for 7.2 is that of the kernel. I believe that the default Redhat 7.2
kernel supports 4GB, however the 2.4 kernels will support up to 64GB if configured
correctly.
Install the kernel source tree with rpm, then:-

cd /usr/src/linux-2.4
make menuconfig

In "Processor type and features" you can set High Memory Support from 4GB to 64GB.

Then build and install the kernel + modules and configure the bootloader
to boot it.

hih
nick@nexnix




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