Re: when to use hugemem

brewman wrote:
On Tue, 04 Jul 2006 07:31:15 +0200, Jan Gerrit Kootstra wrote:


brewman wrote:

Our environment currently is a mix of RHEL 3 and 4 on 32 bit Intel.
We're planning to move everything to RHEL 4. Almost all of our servers
have over 16 GB of RAM and 4 dual core CPUs. We're primarily running
BEA WL and Oracle. I've done some reading from Puschitz about using
the hugemem kernel for Oracle, but I'm unsure about BEA WL. Is it
necessary to use hugemem on every server over 16 GB? All of the
servers will be HA/clustered. We're planning to test Oracle first with
hugemem. Does anyone have any feel for whether we will see improvement
with WL on hugemem as well? Any gotchas we should be looking out for
during the transformation to RHEL 4/hugemem.
Thanks.

Brewman,


RHEL AS or RHEL ES? Probably AS because of the number of physical cpu's, am I right?

With the 'standard' smp kernel you should be able to address 16GB, over the hugemem or large smp kernels are more appropriate.


Kind regards,


Jan Gerrit Kootstra


Thanks for the response Jan. Yes we are using RHEL AS, mostly 3 but likely
moving to 4. So I am hearing we should be using hugemem on every server
over 16 GB, which in my case is almost all of them...web servers would be
the only exception I think. Any gotchas to look out for?

Brewman,


I would go for the RHEL AS 4, because 3 is old. RHEL 5 will be out around the Q4 2006 or Q1 2007 (my estimate, Red Hat has not mentioned a release date yet. Just based on the 18 month cycle). So you loose on support time, a release is supported for a period of 7 years.

See what the demands are the software vendor has. Some do not support certain kernels.

How many CPU's will be in the boxes, over 16 you will need the largesmp kernel instead of the hugemem kernel.


Kind regards,



Jan Gerrit Kootstra
.

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