Replicated Standby Database for DB2 for z/OS 
You can protect your SAP data stored on DB2 for z/OS against failure by setting up a replicated standby database with IBM solutions such as:
Geographically Dispersed Parallel Sysplex (GDPS), also called “Geoplex”
DB2 Tracker Site
Note
The site where the database server is initially started is known as the “primary site” and the site where the database is replicated as the “standby site”. In IBM documentation these sites are called:
“Primary” and “tracker” (for DB2 Tracker Site)
“Production” and “recovery” (for Geographically Dispersed Parallel Sysplex).
IBM documentation: Business Continuity for SAP on IBM System z (SC33–8206)