SAP on MSCS and log shipping for DR

[arora_rahul]

Hi Experts,

Can anyone please explain if below is possible :

- We have installed Netweaver 7.01 Java application server on Microsoft clustering which is working perfectly ok.

-Now we are looking at building a DR solution for the above installation using SQL Server 2008 Log-shipping. The DR site has the same MSCS configuration as the primary site.

-If we log-ship the production database and create a secondary database in "standby" or "norecovery" mode, how do we install a Passive SAP Central instance in case we want to failover from the primary to secondary?

- We know that we have the primary database log-shipped to the secondary site and in the event of failure we can switch the roles and make secondary as primary and then perform the system copy steps on the MSCS. the drawback here is that it will take a long time to bring the system online if we perform the system copy. Our RTO is one hour only so this is not acceptable.

Question : Is there anyway we can install the Central Services and Applicaiton servers beforehand on the secondary site on the secondary log-shipped database so that in the event of failure all we do is bring the secondary database primary and then start the SAP on the secondary site ?

If yes then can anyone point me the any SAP note or documentation that has the details of how to do this.

I have already looked at 1101017, 965908 but its not clear how we can perform the installation on the JAVA stack only.

We want to implement similar to what is shows in the below diagram :

http://help.sap.com/saphelp_apo/helpdata/en/fc/33c028d58511d386ee00a0c930df15/content.htm

Appreciate if someone can assist in resolving the above query.

Thank you.

RA

[Former Member]

Thanks Marcus and John for your reply.

I did looked at the HA web page from SAP and configured MSCS for HA but there's no information regarding DR setup. All it says is setup a log shiping which we already know but there's no procedure to setup SAP on the DR site(Passive SAP central instance)

My original question still stands :

- Is system copy the only option that we need to perform at the DR site in the event of failure ( Assumption is that we ieve make the secondary database as primary and also sync file system for JAVA using SAN replication technologies)

- We have to achieve an RTO of 1 hour which is not possible in this case as performing system copy using MSCS HA option will take few hours to setup and test.

-The link "http://help.sap.com/saphelp_apo/helpdata/en/fc/33c028d58511d386ee00a0c930df15/content.htm" shows that we can have SAP PAssive central instance. Whats the procedure of installing this Passive instance on the secondary site so in the event of failure all we do is make the secondary database primary and bring the SAP system online(installed already - no system copy performed) and also file system is already is sync.

Thank you.

RA

[former_member189546]

hello,

See link for high availability

www.service.sap.com/ha

regards,

John Feely

[markus_doehr2]

> Question : Is there anyway we can install the Central Services and Applicaiton servers beforehand on the secondary site on the secondary log-shipped database so that in the event of failure all we do is bring the secondary database primary and then start the SAP on the secondary site ?

A Java based system stores lots of its configuration also on the filesystem - as opposed to ABAP. So you will have to sync the filesystem also to get the system back online, not only the database.

> If yes then can anyone point me the any SAP note or documentation that has the details of how to do this.

> I have already looked at 1101017, 965908 but its not clear how we can perform the installation on the JAVA stack only.

Since you need the filesystem content also to be in sync with the database there is no "standard" way of doing this.

You could try to build up a Windows DFS replication and so keep the files on both systems identical:

http://technet.microsoft.com/en-us/library/cc773238%28WS.10%29.aspx

Markus