Our smallest SAP system that actually does anything is 3GB. We have a
few 4GB systems. All of our
production ECC systems are 6GB. But then on a 6GB system, we can get
almost 300 MMPP
users (to do that we have to have 2 VDISKS and 4 mod3 drives for swap.)
Determining the appropriate size for an SAP application server is an art
that we are not
very good at. You have to know what sort of SAP buffer and Java sizes
your basis people
are setting up. For example, SAP recommends that out of the box, you
set a Java Heap of
2GB. (Never mind that this may cause huge garbage collection pauses).
You have to have
all of heap resident to get decent response time. So you add some more
RAM for the operating
system, DB2 Connect, etc, and all of a sudden you can have a 2.5 to 3 GB
machine. If your
application does not really require a 2GB heap and you have someone who
will experiment
with heap sizes, you can shrink the RAM requirement. If not you are stuck.
On an ABAP system, you have all of those buffers that the Basis folks
can set to consume
memory. Then there is the SAP extended memory that contains the user
context. Each user
consumes a certain amount of RAM to hold their user context. You want
the person who
signs on in the morning, and does not really do anything until they get
ready to go to lunch,
to get their user context paged out. So for an ABAP system, you need to
hold the operating
system, the SAP kernel, most of the SAP buffers, and the user contexts
for the active users.
Ron
Ceruti, Gerard G wrote:
HI Peter, Ron
I am trying to get a feel if the memory requirements on say a pSeries of
3GB for a SAP APP server would be less on zSeries Linux under zVM, i.e.
the physical would drop to 1 GB with 2GB as swop.
Regards
Gerard Ceruti
may the 'z' be with you
-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Pieter Harder
Sent: 05 February 2008 03:51 PM
To: [email protected]
Subject: Betr.: SAP Application Servers
Hi Gerard,
I have only one 700 system (our SolMan 400 system). Our standard is
ERP2004 which is 640 based. Everything running under z/VM 530. We tried
running bare metal in the porting phase, but dropped that for all the
reasons mentioned on the list.
That one 700 instance is running in a 1G VM, while all other 640
instances have at least 2G. But then our SolMan is only used where it
can't be avoided....
Anyway, anything specific you want to know?
Best regards,
Pieter Harder
[EMAIL PROTECTED]
tel +31-73-6837133 / +31-6-47272537
"Ceruti, Gerard G" <[EMAIL PROTECTED]> 02/05/08 8:45
Hi All
Anyone who is running SAP Application servers under zSeries Linux, bare
metal or zVM that could share some information,
SAP kernel 700,710 would be ok, in particular the memory requirements is
of interest to us.
Regards
Gerard Ceruti
may the 'z' be with you
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