How to increase RAM memory capacity in RHEL5 ?

[Yaboto]

Hi,

My RHEL5 server has been originally installed with 24GB of RAM memory modules.
I have recently upgraded the RAM to 32GB.
At the server level I could see the new upgraded capacity of 32GB been detected, but not at the RHEL5 OS level. The RHEL5 OS is still seing only the original 24GB.

What commands in RHEL5 are used to determine and check the amount of memory ?

How would I effect the physicall upgrade into the RHEL5 OS ?

Thanks

[Modris Bremze]

Is that RHEL 64bit?

Check memory with either:
cat /proc/meminfo | grep -i memtotal
free -m

[dirk dierickx]

very confusing, you're saying that the OS only sees 24GB ram, and then ask how to check what the commands are to check the amount of RAM.

what command did you use to conclude RH5 still only sees 24GB of ram?

[SoorajCleris]

I have the same query mention above by Drick!!!

[SoorajCleris]

Sorry for the typo drik

Regards,
Sooraj

[Dennis Handly]

>Sooraj: Sorry for the typo drik

(Perhaps you should use cut&paste. ;-)

[SoorajCleris]

He he he :)

[Arockiasamy]

Mr, Yaboto,

At first, Check the RAM installed properly or not.
Check the RAM speed.
Check the RAM slots.
Check in BIOS whether its showing 32GB or not.
Then check with cat /proc/meminfo & free.

If it is not showing in BIOS, that is hardware problem. Then check the RAM with other machine & confirm it.

It maybe the hardware problem.

[Yaboto]

Please the 32GB is showing in the BIOS, but only 24GB is showing in the RHEL5 OS.

After physically upgrading a RAM memory, do we need to rebuild the kernel or setting some memory parameters in RHEL5 OS before the RHEL5 OS sees the new upgraded size ?

If yes, how to do it ?

[Viktor Balogh]

Hi,

>After physically upgrading a RAM memory, do we need to rebuild the kernel or setting some memory parameters in RHEL5 OS before the RHEL5 OS sees the new upgraded size ?

I am not aware of any limit around 24Gig. A 4 Gigabyte limit is there, above that you should use a PAE-enabled kernel, which supports RAM up to 64GB. 24GB shouldn't be a logical limit if we think it over with a base-2 number system, but fixme.

Regards,
Viktor