BWA soft memory limit

[Former Member]

Hi

Is there anyway to impose a soft memory limit to the BWA software? I have need a system to have around 80GB of memory. With 24GB blades this mean I would end up with 96GB of memory, 16GB more than I need and as we all know BWA licensing is not cheap.

Note 1259294 - BWA 7.00: Main memory size for BWA blades, does state that mixed memory sizes are OK. So I could go with 3 x 24GB blades and 1 x 12GB blades to give me 84GB but I am a little uncomfortable with it. Ideally I would like 4 x 24GB blades with a soft limit applied to the BWA software of 84GB. Is this possible?

If not another way to do this would be to limit the amount of memory to 21GB per blade (with the Linux boot parameter mem=x), would this be supported or not?

Thanks in advance.

Steve.

[former_member93896 · Accepted solution]

Hi Steve,

data volumes are growing all the time. My guess is that you will fill up the 16 GB soon anyway.

Regards,

Marc

SAP NetWeaver RIG

[Former Member · Accepted solution]

Hi Marc.

I appreciate your response but it does not answer the question. The company does not want to pay for 3 more 4GB BWA licenses until they are required.

So is there a way of limiting the amount of memory BWA uses? If not would SAP support a 24GB Blade where only 21GB is seen/available to the kernel by limiting the maximum memory at boot?

Thanks in advance.

[former_member93896 · Accepted solution]

Hi Steve,

I don't know any customer who has implemented a soft memory limit for licensing reasons. I guess a soft limit would work. However, ultimately the SAP Account Exec has to make the call here (if this is ok or not).

Regards,

Marc

SAP NetWeaver RIG

[Former Member]

Hello Stevie

We have three landscape and we dont use soft limit. If you really worried about the cost, you go for 324 and 112 which is also supported. This is called hetro genious landscape and supported by SAP as well. if you have a softlimit and then again it wil be hetrogenious landscape only. There is no difference

Also note BWA memory is not yet fully stable and most of the TREX REV has memory leaks. So you need to have room for growth and system should be cater for handling the memory leaks.

If you think abt the cost for 12 GB, please do conisder the availability as well.

Regards

Karthi

[Vitaliy-R]

I agree with Marc: check with SAP rep if they agree to change licensing model if you change available memory.

The other thing you might to look at is how much of the sized memory are for current needs, and how much is for future growth. Usualy customers plan for 1-3 years in advance to accomodate future volume growth and to avoid another long process of approval of BWA hardware expansion. But my experience is similar to Marc's - with BWA it is rather a problem to have less, rather than to have more, and once business tries BWA, this 1-3 years forecasted capacity is consumed in 3-6 months.

Regards,

-Vitaliy

[Former Member]

Hi.

Thanks for all the help with this. I will let the customer know to speak to the SAP rep about the licensing model.

I agree with all posts that state that data volumes are growing all the time and this would only ever be a stop gap.

Cheers all.

[andre_richter]

Hi,

if you really need 80GB of space, and you have 96 GB of RAM you will even then get red alerts from the application all the time that will remind you that you could run out of memory. An unacceptable status for a productive system. You should add one or two more blades to have a comfortable environment. Don´t forget to plan at least one blade as a spare/failover blade as well. As far as I know SAP will only charge the used RAM anyways, so it should just be the extra HW that will cost you some bucks, but compared to the licenses... peanuts...

Cheers Andre