Topic: SOLVED: Max RAM supported?

[TTown]

Hello Everybody,

knowing that Squid and Webmail perform better with more RAM available, how much can I throw at it? My Motherboard supports 8 GB, but how much can the OS handle? Since I am looking at accomodating about 800+ clients I thought this might be worth investing in.
Are server Motherboards with RAM > 8 GB supported?

Stefan

[Jontu Kontar]

The short answer is "no".  To my knowledge, SME Server is a 32-bit OS and as such is incapable of addressing more than 4Gb of RAM.

[byte]

The short answer is "no".  To my knowledge, SME Server is a 32-bit OS and as such is incapable of addressing more than 4Gb of RAM.

Short answer is yes actually. Have a search in the forums as this has been asked a few times, also check:

http://smolt.contribs.org/stats.html

and view the "ram" tab

[TTown]

Hello byte,


I guess I didn't use the right search keywords and thus didn't find a proper answer.

http://smolt.contribs.org/stats.html

Is really interesting statistics. Thank you for pointing me to it.

I am not too sure about its implications for me, though.
[RAM tab] 44 server use > 4 GB. Does this number show what is used by the OS or what the BIOS reports?
[Archs tab] 1 server is running X86_64
Where are the "real" OS based limits for usable RAM in the standard Arch branch (i686)? (I'd rather stick with the best supported / main branch)

Thank you for your input.
Stefan

[Stefano]

Hi..

take a look here: http://www.centos.org/product.html

with bigmem/hugemem kernels you can use up to 16GB

btw, it's a 5 sec. research on google with "centos max memory"

HTH

Stefano

[Jontu Kontar]

You might want to take a closer look at that chart.  You can use up to 16GB but it is only supported on SMP kernels (see note 4).  I don't think this effects SME yet, but the Hugemem kernel is not supported in CentOS 5.

I might recommend using "uname -r" through an SSH session to determine if you have an SMP kernel loaded.  aka *.ELsmp

If so, then you might well have an answer.

[Stefano]

You might want to take a closer look at that chart.  You can use up to 16GB but it is only supported on SMP kernels (see note 4).  I don't think this effects SME yet, but the Hugemem kernel is not supported in CentOS 5.

I might recommend using "uname -r" through an SSH session to determine if you have an SMP kernel loaded.  aka *.ELsmp

If so, then you might well have an answer.

you are right but.. nowadays all new cpu are multicore

a dualcore cpu is seen as a dual physical cpu so you'll always use smp kernel

btw 16GB ram seems to be enough.. isn't it?

Ciao
Stefano

[arne]

If it is SME 7.x, (Based on Centos 4.x) I think the actual max limit is 64 GB of RAM. http://www.redhat.com/rhel/compare/