I'm glad David asked this question, because I have the same one, as I have been 
digging around in the backups table trying to figure out what goes on.

The question is, if retextra is 15 and retonly is 15, and you take one full 
NDMP backup followed by 20 diffs, does anything roll off?
How many fulls and diffs do you have left in the DB?

Does the retextra/retonly apply just to the fulls, or just to the diffs? Both? 
How?

Wanda


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Christian Svensson
Sent: Wednesday, February 22, 2012 10:27 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] SV: What if

Hi,
The Full Backup and Inc Backup are the same object for TSM.

That mean if you backup the Full Backup with Managment Class A then backup 
Incremental with MG Class B, TSM will then change the FULL backup to MG Class B.

Best Regards
Christian Svensson

Cell: +46-70-325 1577
E-mail: Christian.Svensson AT cristie DOT se
CPU2TSM Support: http://www.cristie.se/cpu2tsm-supported-platforms

Join us at Pulse 2012: http://www.ibm.com/pulse

________________________________________
Från: Ehresman,David E. [deehre01 AT LOUISVILLE DOT EDU]
Skickat: den 22 februari 2012 14:20
Till: ADSM-L AT VM.MARIST DOT EDU
Ämne: What if

What if there were a

1)      storage pool with retonly=15 and retextra=15

2)      it received data from a backup node (NDMP) process

3)      the NDMP runs a full backup once every six months

4)      the NDMP run an incremental monthly on the months a full is not run

What data does TSM actually retain?

David