Post-Installation of RAC: main directory and file to set ORACLE_HOME ?

Folks,
Hello. I am installing Oracle 11gR2 RAC using 2 VMs (rac1 and rac2) whose OS are Oracle Linux 5.6 in VMPlayer according to the website http://appsdbaworkshop.blogspot.com/2011/10/11gr2-rac-on-linux-56-using-vmware.html
I have just finished installing Grid infrastructure and RAC database 11gR2 successfully.
After that, I add the entries into the file /home/ora11g/.bash_profile as below:
export ORACLE_SID=racdb2;
export ORACLE_HOME=/u02/11g_db/ora11g/racdb;
export GRID_HOME=/u01/app/grid;
PATH=$GRID_HOME/bin:$ORACLE_HOME/bin:$PATH; export PATH;
After that, I run the following command:
[ora11g@rac2 /]$ /u02/11g_db/ora11g/racdb/bin/srvctl config database -d racdb
Its output:
ORACLE_HOME environment variable is not set.
ORACLE_HOME should be set to main directory that contains Oracle products.
Set and export ORACLE_HOME and then re-run.
My questions are:
First, I have added entries into the file /home/ora11g/.bash_profile. Why it still says "ORACLE_HOME environment variable is not set" ? Is this way wrong ?
Second, what are the main directory and the file to set ORACLE_HOME ?
Thanks.

Folks,
Hello. Thanks a lot for replying. I reboot OS and run the commands as below:
[ora11g@rac2 bin]$ ./srvctl config database -d racdb
Its output:
PRCD-1027 : Failed to retrieve database racdb
PRCR-1070 : Failed to check if resource ora.racdb.db is registered
Cannot communicate with crsd
[ora11g@rac2 bin]$ ./sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Fri Mar 9 15:28:59 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter user-name: SYS
Enter password: SYS
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Process ID: 0
Session ID: 0 Serial number: 0
Enter user-name: SYSTEM
Enter password: SYSTEM
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Process ID: 0
Session ID: 0 Serial number: 0
Enter user-name: SYSMAN
Enter password: SYSMAN
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Process ID: 0
Session ID: 0 Serial number: 0
SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus
[ora11g@rac2 bin]$
As we see the outputs above for the 2 commands "srvctl" and "sqlplus", my questions are:
First, why cannot retrieve database racdb ?
Second, sqlplus is poped up. Why users SYS, SYSTEM, SYSMAN cannot log in ?
Third, does my RAC database installation have problems ?
Thanks.

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