DR Site - Dataguard - Virtual Hostname - Recommendation

Hello SAP Gurus,

We have installed the below HA System in our Primary Site. 

We have same SID for SAP & DB. Due to HA, we used Virtual-Host-name/IP in our Primary Site.

Now we are in process of setting up our DR Site.

•   We planned to use the Virtual-Hostname/IP in DR.
•   We planned to use Oracle-Data-guard for DB Replication at DR Site

Our environment

OS     : Solaris 10

DB     : Oracle 11.2

SAP   : NW7.0 / ECC 6.0 Ehp3 (Abap+Java)

Host-entry of Primary Server

erpph01 10.1.1.10      #Physical Host

erpdb      10.1.1.83        # DB Instance

erpd00    10.1.1.80       # PAS

erpscs     10.1.1.81        # Java CI

erpascs   10.1.1.84        # ABAP CI

Planned Host-entry for DR Server:

erpdr01   10.2.1.10      #Physical Host

erpdb      10.2.1.83      #DB Instance

erpd00    10.2.1.80      #CI+PAS

We got below queries:

1. Can we use the same virtual host-name for SAP & DB in DR Server?
2. How to up the DR Host in the fastest way without changing manually the ip address, host name in  ABAP &JAVA parameter files, Instance Profiles ?
3. How we can synchronize from Production Site SAP Application files (Instance profiles, Java configuration files, binary files..) to Disaster Recovery Site?   

Thanks for your feedback.