TSM NDMP Differentials and Expiration

[edaguero]

Hi,


We are running TSM 5.5 and have been running NDMP Backups for our EMC Isilon NAS.
Due to the amount of data that we have (over 100TB) we are unable to schedule in a full backup due to time constraints.
Our original full backup took around 6 days to complete with 2 dedicated Tape Drives.


At present, we are solely running Differential backups and are quickly filling up the tapes.
Does expiry take place on older Differential backups, or does a Full need to take place to implement this?


Below is our copygroup.


Policy Policy Mgmt Copy Versions Versions Retain Retain
Domain Set Name Class Group Data Data Extra Only
Name Name Name Exists Deleted Versions Version
STANDARD ACTIVE ISIMC STANDARD 2 1 30 60


Thanks

 

[marclant]

The short answer is that the differentials are currently expiring. You are keeping 2 versions, so just the last 2 differentials. The full is also kept because it is needed to restore those differentials.

The long answer is here:
http://www-01.ibm.com/support/docview.wss?uid=swg21200154

Marc...