Standby Database, Java Stack

[Former Member]

We have a standby database running on a secondary host.

The primary host name and the secondary host name are different.

Our system is an ECC 6.0, running ABAP + Java add-in.

The Java part contained in filesystem (/usr/sap/<SID>/DVEMBGS00/J2EE) is not refreshed onto the secondary host, since it is not contained in the database.

How could we refresh these changes onto the secondary host (for instance, new java developments, or standard patches) ?

-We can not copy this filesystem from the primary host into the secondary host, since hostnames differ, -and host name change is not supported for a productive environment

-We are exporting this information from time to time, and we plan to import it if we had to promote the secondary host into primary host, afer having opened the standby database.

Is there an easier way to have standby database high availability, for ABAP+JAVA systems?

In case the primary host name and the secondary host name would have been the same, could we just copy the /usr/sap/<SID>/DVEMBGS00/J2EE directory across machines? (that is to say, backup up + restore, instead of export + import)

Thanks very much in advance,

Eva Verdaguer

[Former Member]

Eva,

The first step is to convert your ABAP+Java instance to use logical hostname instead of the physical hostname. You have to change ABAP profiles to use logical hostname (ABAP is relatively easy) and export/import java with the the logical hostname using the system copy process.

Now if your standby host is in the same datacenter, you can cross mount all your application file systems (/sapmnt/<SID>. /usr/sap/<SID> etc) on the standby host. I am assuming your application file systems are on external storage. If your standby host is in a different location, you need a process to copy the file systems to remote site. You can use backup/restore or use a replication process to replicate file systems (like NAS replication). You have to make sure the system is offline to copy the files specially the J2EE related files.

-RK