Need some suggestion doing database backup

Hi All,
I am working on the 11gR2 RAC oracle database and below are the details.
SQL>select * from gv$version;
INST_ID BANNER
2 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
2 PL/SQL Release 11.2.0.1.0 - Production
2 CORE 11.2.0.1.0 Production
2 TNS for Linux: Version 11.2.0.1.0 - Production
2 NLSRTL Version 11.2.0.1.0 - Production
1 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
1 PL/SQL Release 11.2.0.1.0 - Production
1 CORE 11.2.0.1.0 Production
1 TNS for Linux: Version 11.2.0.1.0 - Production
1 NLSRTL Version 11.2.0.1.0 - Production
3 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
3 PL/SQL Release 11.2.0.1.0 - Production
3 CORE 11.2.0.1.0 Production
3 TNS for Linux: Version 11.2.0.1.0 - Production
3 NLSRTL Version 11.2.0.1.0 - Production
ps -ef|grep pmonoracle 11077 11067 0 10:37 pts/0 00:00:00 grep pmon
oracle 12383 1 0 2011 ? 00:16:18 ora_pmon_cc2crt2
oracle 12432 1 0 2011 ? 00:07:43 ora_pmon_cc3crt2
oracle 12437 1 0 2011 ? 00:07:11 ora_pmon_cc4crt2
oracle 12814 1 0 2011 ? 00:06:01 ora_pmon_ccoreqal2
oracle 12816 1 0 2011 ? 00:05:50 ora_pmon_ccorecrt2
I have 5 databases in these three severs and having around 20 GB of size except one database. The size of the this database (ccoreqal2) is 7.5 TB. I have took the full database backup using expdp for all DB's except the BIG size DB. i am not able to use the expdp because of the size. Which way is best to do the backup for this big size DB.
The purpose of taking the backup is, we are upgrading our oracle to 11.2.0.3 and We don't have any regular backups (RMAN or EXPORT) on these databases. these are QA databases.
Please let me know, how i need to prepare for this DB backup.
Thanks in advance for your help.

>
i am not able to use the expdp because of the size
>
Why not? You can have expdp create multiple files on export so that each file is no larger than the size you specify. This makes it easier to manage large exports.
Using multiple files and a parallel export will handle this for you.
See the DUMPFILE section of the database utilities doc - http://docs.oracle.com/cd/B19306_01/server.102/b14215/dp_export.htm
It has this example of file splitting using PARALLEL
>
Example
The following is an example of using the DUMPFILE parameter:
expdp hr/hr SCHEMAS=hr DIRECTORY=dpump_dir1 DUMPFILE=dpump_dir2:exp1.dmp,exp2%U.dmp PARALLEL=3
The dump file, exp1.dmp, will be written to the path associated with the directory object dpump_dir2 because dpump_dir2 was specified as part of the dump file name, and therefore overrides the directory object specified with the DIRECTORY parameter. Because all three parallel processes will be given work to perform during this job, the exp201.dmp and exp202.dmp dump files will be created and they will be written to the path associated with the directory object, dpump_dir1, that was specified with the DIRECTORY parameter.

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