PI 7.0 (1 Central Instance + 1 Application)

Hello everybody!
I have an invoice system (with lots of BPMs) that works fine most of the time, except one day of the month, when the number of invoice requests goes from Y to 100 x Y and my PI system slows down.
My PI system is made of only one central instance. We are about to install/add an application server and we would like to direct (send) all these "extra" invoice requests to this application server. Is it possible? I cant figure it out how to do that! I first thought it would be possible to use two different RFC Destinations in my sender system (SAP ECC 5.0). But when I use the option "Registred Server Program" I specify the address of the SAP ECC system not the address of the PI system.
Regads
Julio

While I am not a expert with WebDispatcher , I think such settings if possible will be done only the WebDispatcher.
I would suggest also sending this query to the web Application Server forum.
My gut feel says - this might not be actually possible.
Do keep us updated. Thanks!
Regards,
Bhavesh

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Difference Between central instance And application instance

Hi every body can any one tell me that
what is the difference between Central instance and Application instance.
If i am using 4.7 ee with orcale data base.

Check these links
http://oreilly.com/catalog/sapadm/chapter/ch01.html
Basically these terms comes when you are working on live servers where all the users log into to do their daily work.
We says when we want to distribute the workload on servers we requires central instance and application servers.
Normally it is not known to common users where they are logging into...but they can login directly usign the specific Instance details of servers.
Please see this also
http://help.sap.com/saphelp_nw2004s/helpdata/en/c4/3a64e8505211d189550000e829fbbd/frameset.htm

Difference between Central Instance and Application server?

Can anybody let me know the exact difference betwwen a Central Instance and An Application server?

I think it can help you to understand the concepts:
http://help.sap.com/saphelp_40b/helpdata/en/08/5741a84ae611d1894f0000e829fbbd/content.htm
Best regards,
Itamar Marioto

64 bis DB server with 32 bit central instance

HI,
i ve got a question concerning the hardware configuration of a SAP-landscape. Is it possible to run a standalone dbserver with 64 bit and a central instance (sap application server) with a 32bit machine. I mean does it work, that the data from application server is transferred to the db-server in this constellation ?

Hi Marek,
This is supported once http://service.sap.com/pam lists the combination of DB/OS and SAP kernel for the instances.
It is always important to bring the 32bit and 64bit Kernel to the same (or almost the same) kernel patch after the installation - otherwise the instance(s) might not start. You should restart the system also when updating the kernel for one platform.
Regards, Mark

How to make upgrade from application server and not from central instance?

Hello SAP Gurus!
I have SAP ECC release 6.0, and I´m gonna make upgrade to enhancement package 6.06, do you know if Can I make upgrade from application server, but not from central instance?
Thanks.

Hi Victor,
Upgrade process has to execute from the server where message server is running.
So I guess it is not possible to initiate the SAP upgrade from application server.
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Deepak Kori

Place file in central instance(AIX/UNIX) from Application server in Windows

Hi guys,
We have the central instance running in AIX and app servers in AIX/UNIX as well. now we want to replace the app server by windows server.
so central instance remain as AIX/unix server and app server becomes Windows NT.
then how can i place a file in my central instance while using this Windows based app server... because open dataset with forward slash (/usr/sap/) will be not be interpretated by windows,
so i used logical file name.. and kept both windows and unix path..
unix path as /usr/sap/tmp/<File_Name>
and windows path as
servername\usr\sap\tmp\ and even tried with
usr\sap\tmp\
nothing worked.. when i used open dataset fetching the path from logical path, it ways unable to open the file..

Hi,
you can't directly open file on central instance if you are not connected to it. You have access only to files which are on application server which you are connected to. If you want to have a folder which will be accessible from all application servers then you need to map folder on application server to folder on central instance.
To solve the issue with different paths for different operating systems you can use transaction FILE. Here you can define a logical filename where you can configure different paths for different syntax groups such as UNIX or WINDOWS NT. You can use FM FILE_GET_NAME to get valid path for application server.
Cheers

Proxy triggering in central instance but not in application

Hi friends,
There is one report which triggers the proxy. but this is not triggering in application servers and it is working fine when i trigger it in central instance.
In this case i am executing this report in background and at that time i can't check whether it is executing in central or application.
i need to do any configuration in application servers so that this error will not come..
And when i am updateing the sap tables by server proxy it is gettinng struck in queue and each time i need activate the queus.. if i need to execute this interface at nights this should not happen..
so for all these we need to do any settings..
Regards
Vijay

Hi,
>>And when i am updateing the sap tables by server proxy it is gettinng struck in queue and each time i need activate the queus.. if i need to execute this interface at nights this should not happen..
Make sure that You have cleared all the Strucked messages from the Queues before doing the bellow steps.
Goto SMQR and just Delete all the Queues.
Goto SXMB_ADMManage Queues-Just Say Register Queues Dont say Activate and all.
Now try to execute the scenario and this time it shld floe the message
REgards
Seshagiri

Difference between application server and central instance

Hi everyone,
whats the difference between application server and central instance and message server. where it will be installed. and how?
Regards
Basis Fresher

Hi,
just want to clarify that is is not correct that only one enqueue process can be configured on the CI.
Please see the documentation within transaction RZ11 for the parameter Parameter : rdisp/wp_no_enq
Short description : number of enqueue work processes
Parameter description :
You can use this parameter to define the number of enqueue work processes for the instance.
Ensure that a value >0 is only set on the central instance that provides the enqueue server (instance rdisp/enqname ). One enqueue work process on the central instance is normally sufficient (rdisp/wp_no_enq = 1); only in very large systems can a higher value be useful.
Kind Regards
Thomas Alt

Differnce between central instance ,dialog instance and application instanc

Hi all
Please explain me what is central instance. what is it differnce betwenn the
other instances like dilaog instance ,apllication instance.
What is the exact use of having many instances ?
regards
Sanjeev.S

Hi Sanjeev,
First of all let me Clarify between Cental instance(CI)and Central Service instance(SCS). When you install NW04/NW04s systems on WIndows, when you open you windows console, you would first find the SID name that you have installed and when you expand this you'll find 2 instances. When you expand the first instance you'll find that there are message server and Enqueue server listed. This instance is called as Central Service instance or simply called SCS. You can look at the folder structure /usr/sap/<SID>/.
Now the second instance is called as Central instance, when expanded you would see a SDM, a dispatcher and a server node. This is the instance which processes all your requests.
Now answering your question about Dialog instance, When the CI is overloaded, i.e. your dispatcher is overloaded and your server is overloaded , you would install a dialog instance, which means that the database need not be installed for the Dialog instance and it can be on any system. While installing the Dialog instance it would ask you which Cental instance I have to refer, then you would be giving the necessary system to which you have created a dialog instance.
Giving a graphical view,
SID < J2E>
< DATABASE>
<hostname>00 message server
                        enqueue server
<hostname>01 SDM
                        dispatcher
                        server0
This is your one SAP system. Now you feel that this system is overloaded with lot of users, any there are many user who will be logging in again, so what you would do is install a dialog instance which would be referiing to J2E database but will have its own dispatcher and server0. SDM, message server and enqueue server are only one per systems.
Now the dialog instance for J2E would look like this
SID < K2E>
<hostname2>01 dispatcher
                         server0
Dialog instance is mainly for load balacing, now you can access the database of J2E by typing a different URL i.e. of K2E and hostname2 but still accees the data of the J2E. The communication between Dialog and Central instance is thru message server.
In case you find it difficult to push thru, please let me know..

Error in Central Instance installation ERP 2005 Distributed System

Hi All,
I am currently trying to install Central Instance for ABAP Distributed system on AIX.
During the installation I encounter this error message:
WARNING 2006-09-20 14:22:39
Could not determine a valid JAVA_HOME directory from the environment.
INFO 2006-09-20 14:22:39
Creating file /tmp/sapinst_instdir/ERP/SYSTEM/ORA/DISTRIBUTED/AS-ABAP/CI/FormalPasswordCheck.log.
ERROR 2006-09-20 14:22:39
FSL-04008 Unable to access application bin/java. A file or directory in the path name does not exist.
Before the installation SAPINST_JRE_HOME and JAVA_HOME variables were set to /usr/java14.
Please help.
Thanks,
Chie

Hi Chie,
definately wrong
the output should be similar to this one:
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
Classic VM (build 1.4.2, J2RE 1.4.2 IBM AIX 5L for PowerPC (64 bit JVM) build caix64142sr1aifx-20051020 (SAP 142SR1a + 88494 + 84428 + 83602 + 89528 + 90372 + 88233 + 66827 + 92741 + 95636 + 96556 + 96581) (JIT enabled: jitc))
note the "64 bit" and "SAP" in there...
You can download it here:
https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=javasap
Regards,
Pascal
PS: please give points for helpful answers

Why do we do kernal upgradation in central instance only

Experts,
I have a question. Why do we do kernal up gradation in central instance only? what about other instances? How the up gradation takes place in other instances?
points will be awarded to all helpful answers.
Thanks in advance.
Rajesh

Hi,
Whatever the other two friends have explained is correct. We do kernal upgrade only on CI when the Operating systems of the CI and the Application Instances are same.
if the CI and AI are in different operating systems then we may have to upgrade kernel in both CI and AI.
Sapcpe.exe would synchronize the kernel only when the SAP systems have homogenous OS.
Reward points if useful.
Thanks,
sree

Central instance and SAP instance

hello,
Im confusing with Central Instance (CI) and SAP instance (Application Instance)
According to my understanding, i think SAP instance is running on all the Aplication servers. (if having 4 Application servers, in all those servers, SAP instance is running concurrently)
But Central instance is running on 1 of the Application servers only.
- How will the SAP decides on which Application should run the central instance.
Will that CI change automatically time to time.... or do we need to allocate 1 Application server as CI server, when doing the installation.
Is there any relationship between Message server and Central instance.
Does CI contains message services and enqueue service...
plz help me to reslove these issues
Rgds,
Edited by: zerandib on Apr 25, 2010 10:45 AM

*CENTRAL INSTANCE: The SAP Central Instance (CI) is a standalone SAP Basis
unit which provides services used by clients connected to the SAP system.
Among these services are the Message server and the Enqueue server, which
run only on the single SAP Central Instance. The Message server maintains a
list of all available resources in an SAP system, determines which instance
a user logs on to during a client connect, and handles all communication
between SAP instances. The Enqueue server is used by SAP to administer the
lock table in a distributed SAP system. If the CI
server hosting the Enqueue service fails, all SAP transaction locks that
have not yet been committed are lost. R/3 guarantees that no user can
perform a transaction while the Enqueue service is unavailable in order to
guarantee database consistency. Placing the Enqueue and Message services
together on the CI is recommended by SAP since the Message service must
always access the Enqueue service for inter-process communication. These
services provide critical SAP functions that, by existing only in the SAP
Central Instance, suffer from being a single point of failure in the SAP
environment. Obviously, the CI, which contains the Enqueue and Message
services, needs to be restarted as quickly as possible following a failure
so that normal operations can resume.*
Central Instance Has Message server and an enque work Process,
Application Server or dialog Server : Does not have message
server but have work process to reduce the Load on CI*

Windows Central Instance ABAP+JAVA plus UNIX ABAP dialog instances ?

Hi everybody,
we are an SAP software partner and provide SAP complementary software on UNIX and Windows platforms.
Part of our software (a gateway) needs to be installed on the SAP application server.
In order to setup a cross-platform test environment for our developers, I was thinking about extending the existing SAP ERP 6.0 Windows-based Central Instance (IDES, Oracle, usage types ABAP+JAVA) by multiple ABAP dialog instances which run on different UNIX flavours (Solaris, AIX, Linux).
I searched the SAP Notes and found nothing which could confirm my plans, as this is quite an unusual setup and heterogenous systems are usually the other way round (CI on UNIX, DI on Windows).
SAP Note 1067221 however mentions that DIs on different OS platforms are only partly supported, but it seems this is only valid for JAVA DIs?
As I need only ABAP DIs, I hope my plans are fine?
Many thanks for your feedback
Markus

> I searched the SAP Notes and found nothing which could confirm my plans, as this is quite an unusual setup and heterogenous systems are usually the other way round (CI on UNIX, DI on Windows).
Well - what is "usual" depends on the requirements
It's possible to do that. Technically there's no difference whether an application server is Unix or Windows based.
There are, however, a few things to take care of:
- if your system is non-Unicode, sorting algorithms are different on different platforms. Unicode systems use ICU which is cross-platform
- if you want to automatically distribute your kernel on system start you will need to create a "share" on the Windows machine and make it accessible from the various other platforms. You can, however, ensure "manually", that you use the same kernel patchlevels on all systems, then this is not needed
- Windows is LittleEndian whereas most Unix systems are BigEndian, depending on if you exchange data between those systems (means, binary data, files through NFS) the programs must be aware of the fact, that a file can be either LE or BE.
Markus

SAP Central Instance Health check

Hello all,
We have ECC6.0 running on Oracle 10.2.0.2 on SLES10 SP2. We are using Oracle clusterware(11g release 1) and the database is stand-alone. In other words we are using active/passive cluster.
Our requirment is as follows:
We need to create a Linux script that checks if the SAP Central Instance is up or not. If it is not up, then we need to start it. We will then create an Oracle clusterware application resource based on this script. My question is there any SAP binary/utility that checks the status of the Central Instance?
Thanks,
Shilpa

You should be able to ping Message server (ASCS) if there is a repsonse then no need to do anything.
dpmon pf=/sapmnt/<SID>/profile/<CI_profile> -p | grep alive
and you can also use below command to check whether your message server is up or not.
lgtst name=<SID>

Database Instance vs. Central Instance

Hi,
Is there any formal recommendation by SAP to install the central instance on the same server where the database instance is also installed? What would be the trade-off of keeping both on the same machine instead of installing the central instance on a different server? Any help on that will be greatly appreciated.
Regards,
Renilton Soares de Oliveira

Hi,
In addition to resource issue (which is most of the cases valid reason for separating DB and CI) as mentioned by Matt, there is also a security reason people sometimes want to separate DB and CI...
E.g. you can install DB on a separate server which is connected to CI server via a high-speed private LAN. DB server is not opened to Public (User) lan.Only CI server and other application servers are connected to Public (user) Lan.
Cheers !!
Satya
P.S.: Pls reward point if answer was helpful...thx.

PI 7.0 (1 Central Instance + 1 Application)

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