Hi Vimal
In DR, you can follow the steps
1. Take the full DB Backup from primary site.
2. Restart the same in DR site,
3. From the restored DB you can start the SAP installations with same SID but the host name are different from primary site
4. once every thing are working fine in DR site.then start the DB mirroring or replication from the primary to DR Site.
in the same way we are did in Ms Sql 2008 R2 servers
BR
SS