RMAN: Increment backup very slow

Hi All,
We have Datawarehouse database having size around 7TB. Increment backup performance is extremely poor it is taking approx 14hrs to complete the process. We have also enabled block change tracking but failed to meet target.
Below mentioned DB info & RMAN configuration parameters:
DB: 11.1.0.6
OS: Linux 2.6.18-128.el5 x86_64
System has 16 processor when more than two process per CPU i.e. 32
CONFIGURE RETENTION POLICY TO REDUNDANCY 5;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/d01copy/control_bkp/autobackup_control_file%F';
CONFIGURE DEVICE TYPE DISK PARALLELISM 13 BACKUP TYPE TO COMPRESSED BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BZIP2';
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/app/oracle/product/11.1.0/dbs/snapcf_PRODDB.f'; # default
Thanks in advance.

Thnaks for reply.
Have you configured Compressed backups?
--> Yes. with below command.
RMAN> backup as compressed backupset incremental level 1 tag=$v_tag database;
Have you allocated channels ?
--> Yes.
allocate channel backup_disk1 type disk format '$v_bdest/%U' maxpiecesize 10G;
allocate channel backup_disk2 type disk format '$v_bdest/%U' maxpiecesize 10G;
allocate channel backup_disk3 type disk format '$v_bdest/%U' maxpiecesize 10G;
allocate channel backup_disk4 type disk format '$v_bdest/%U' maxpiecesize 10G;
allocate channel backup_disk5 type disk format '$v_bdest/%U' maxpiecesize 10G;
What is the Large pool size configured? try to increase.
--> large_pool_size=1073741824
Is backup to DISK or TAPE? mentioned in script?
--> Backup goes to DISK only.
How is DISK performance?
--> How can we calculate DISK performance on LINUX?
Regards,

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Considering the Scenario you given:
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ORCLDB wrote:
Hello All,
Oracle 9.2.0.7
Windows 2003 server
Database size around 200 GB.
Daily archive generation may be around 40. Archive log size 200 MB.
We have implemented the below backup strategy
1. weekly once full incremental level 0 backup(differential).
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Now we are facing a problem because of the incremental backup. The incremental backup is taking more than 1 hour time to complete. So we are not able to run it in the production time.its a 24/7 production database.
Please advice how to reduce the incremental backup time ?
Is there any options like what we have in 10g Block change tracking. please advice..
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http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmtunin.htm#CACJCBDB

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in the first hour time machine saved only 10 GB. the external drive is quiet,so i think the drive has nothing to work.
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/p

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http://docs.oracle.com/cd/B19306_01/backup.102/b14191/rcmdupdb.htm#BGBCEBJG
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Andrew,
*_Slow Time Capsule Transfer Via Ethernet_*
*Disable Anti-Virus Software*
“Using virus scanning software can make Time Machine backups very slow. If you use Norton Antivirus 10 AutoProtect or a similar product, try turning it off during backups.” [http://docs.info.apple.com/article.html?path=Mac/10.5/en/15140.html]
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*Slow Full Backup After Restore*
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Cheers!

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