system copy from distributed ->central system

[Former Member]

Friends:

We have an ECC central system i.e. DB and CI are on the same server.

We are doing a system copy using SWPM to create another ECC central

system w/ a different SID.

However, on source system we mistakenly selected "distributed system"

for export which generated a dump for DB and a dump for CI.

We cannot do the export again by selecting "central system" because

we missed the window.

Now we have 2 options to create target as a central system because it

is required to be the same as source:

1. when running SWPM at target, select "central system", but

   a. the dump for DB might be rejected by r3load;

   b. there is no way to let r3load to pick up the dump for CI.

2. when running SWPM at target, select "distributed system", then

   a. install ASCS;

   b. install DB;

   c. install CI.

   Since a, b and c will be done on the same server, we hope the target

   will be a central system which will be identical to the source except

   the SID. My only concern about this is that source system has no ASCS.

please help advice.

Thanks.

[Sriram2009]

Hi Mike

1. SAP Central system consists of ASCS (ABAP Central Service instance) + DI + CI

ASCS Instance
The ASCS instance is the main point of communication and synchronization for the ABAP application server instances. It consists of the message server and the enqueue server for the ABAP stack.

Database Instance
The database instance is a mandatory instance for an SAP system. The application server ABAP uses its own database schema in the database.

Central Instance
The central instance is the core component of an SAP system. It provides all SAP system utilities. Exactly one central instance must exist in each SAP system.

2.      Distribution of SAP System Instances
You can install all instances on a single host (central system) or on separate hosts.
Instances of an SAP system based on AS ABAP are:

• ABAP central services instance (ASCS Instance)
• Database Instance
• Central Instance

Regards

SS

[Mofizur]

Hi,

I believe ASCS is the new architecture for the ABAP Stack. So it won't create any problem. Also for your case as everything is on the same server. So for you i t will be like different folder on same host.  Below links can give you more insight

Thanks,

Mofizur