Grid Control 10gR2 and Data guard for repository HA

Hi,
We have a set up of two instances of OMS running on two seperate servers. I was suggested Dataguard as a failsafe high availability solution. It was to run two seperate OMSs using one single repository database, which has hot standby managed by dataguard.
But, I guess, I am confused that, if my repository fail, there will be no OMS to perform failover in Dataguard GUI.
Am I missing any point? How has others setup their repository? Any help is appreciated ...

Check this out with a mounted database
[lo***p02].oracle:/home/oracle > sqlplus dbsnmp
SQL*Plus: Release 11.2.0.3.0 Production on Mon Jun 4 15:52:11 2012
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
Enter password:
ERROR:
ORA-01033: ORACLE initialization or shutdown in progress
Process ID: 0
Session ID: 0 Serial number: 0It cannot connect.
And then
[lo****p02].oracle:/home/oracle > sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Mon Jun 4 15:57:49 2012
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> select open_mode from v$database;
OPEN_MODE
MOUNTED

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