Oracle RMAN compressed backupset on TSM disk pool

Hello

We have an Oracle 11.2.0.3 database, size * 2.2Tb* on AIX 6.1.

There are a bunch of disks in TSM 6.3, size * 4 Tb *.
When you try to take a Tablet backupset on this pool with the command:
run {
allocate channel ch01 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch02 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch03 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch04 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch05 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch06 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch07 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch08 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch09 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch10 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch11 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch12 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch13 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch14 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch15 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
allocate channel ch16 device type SBT parms 'ENVTDPPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';

BACKUP AS COMPRESSED BACKUPSET FULL DATABASE;

release channel ch01;
release channel ch02;
release channel ch03;
release channel ch04;
release channel ch05;
release channel ch06;
release channel ch07;
release channel ch08;
release channel ch09;
release channel ch10;
release channel ch11;
release channel ch12;
release channel ch13;
release channel ch14;
release channel ch15;
release channel ch16;
}
backup fails with the error:
RMAN-03009: failure of backup command on ch16 channel at 11/28/2012 12:22:17
ORA-19502: write error on file "CS_20121128_qlnrehrm_1_1.DBF", block number 257 (block size=8192)
ORA-27030: skgfwrt: sbtwrite2 returned error
ORA-19511: Error received from media manager layer, error text:
   ANS1311E (RC11)   Server out of data storage space
channel ch16 disabled, job failed on it will be run on another channel
Attempts to run above the command also failed on cluster disks in TSM with size * 5 TB *, * 7 TB *. But this size is 2 - 3 times bigger than the original DB Dimensions (2.2 to).
The last attempt to run our command successful on TSM disk pool of * 15 TB *!. During its execution, we could monitor the use of the disk pool of * ~ 7 TB *. Once the backup is complete, the disk pool released and only * ~ 100 GB * compressed backupset remained.

-----
So the question is: is this a problem or an RMAN or TSM normal?

We will be very greatfull for your kind answers!


Kind regards
Iago

Hello;

Not sure how the algorithm works or how the channels have an effect on the compression. Would assume its done in memory or speed would suffer.

It shows all and testing them to get an idea of what to expect:

RMAN backup compression

http://gavinsoorma.com/2009/12/11g-release-2-RMAN-backup-compression/

And so for this:

http://taliphakanozturken.WordPress.com/2012/04/07/comparing-of-RMAN-backup-compression-levels/

And finally:

http://www.dbspecialists.com/blog/database-backups/RMAN-compression-algorithms-in-11gr2/

Best regards

mseberg

Published by: mseberg on December 7, 2012 03:52

Tags: Database

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