Look in the dsmsched.log file.  
You will see the notation EXPIRING whenever TSM detects that a file it
had previously backed up, is no longer on the drive.
(The term EXPIRING is a bit misleading.  It doesn't mean TSM has deleted
the backups of the file; it means TSM has detected the file is gone, and
starts counting the days until the management class says the backups are
to be purged for deleted files.)

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
yoda woya
Sent: Thursday, March 18, 2010 6:46 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] finding out information deletion of file

how could I find out when TSM became aware the a file was deleted from a
node