EHP5 Upgrade - DR Activity

Dear All,

We are upgrading our SAP System from ECC6 to EHP5.

Platform : Hp Unix 11.31, Oracle 11.2.0.3

We have Disaster Recovery Server. We are using Oracle Standby Database (Managed Recovery).

After upgradation what activity I need to do on production server.

I need to re-install EHP5 on DR Server and Restore database again ?

Request you to please share your experience.

Thanks and Regards,

Nirav