Swap memory & CPU rules

[Former Member]

Hi people,

I need the requirements for choice the amount of CPU and type, and the rule to calculate the amount of swap memory of productive system. The amount of physical memory is 12 GB RAM.

In the installation guide says that PHYSICAL MEMORY+ 14 GB= Swap memory. Is this avalaible for productive system.

More thanks.

[sunny_pahuja2 · Accepted solution]

Hi,

SWAP should be at least 2*RAM.

Thanks

Sunny

[Former Member · Accepted solution]

Thanks Sunny Pahuja,

But there are any documentation or guide that explains this?

More thanks

[JPReyes · Accepted solution]

Ruben this is quite a frequently asked quetion...

Basically if your system is Unix based the thumb rule is that SWAP should be 3 times your physical memory (been 12 gb it shouldn't be much of an issue). In windows 64bit usually 20Gb of swap (pagefile) is enough for most installations

There is info at help.sap.com about this.

Regards

Juan

BTW, why won't you trust the info on the installation guide?

[Former Member · Accepted solution]

But In the installation guides, explais that the swap memory will be 1 times RAM plus 14 GB

Edited by: Ruben Torres on Jun 15, 2011 4:25 PM

[sunny_pahuja2 · Accepted solution]

Its there in the installation guide. I am copying below extract from installation guide

Swap Space

You need hard disk drives with sufficient space for swap. You can calculate the required swap space as follows:

Twice the main memory structure (2 x RAM) with a maximum of 20 GB per SAP Instance.

For more information, see SAP Note 153641.

You can display and u2013 if required u2013 modify the existing swap space.

Thanks

Sunny

[JPReyes · Accepted solution]

Thanks Sunny for digging into the documentation.

Regards

Juan