TSM purge records

Hi,

Is there any reason that TSM delete some records of about one year's old?

          Available Space (MB): 192
        Assigned Capacity (MB): 192
        Maximum Extension (MB): 0
        Maximum Reduction (MB): 72
             Page Size (bytes): 4,096
            Total Usable Pages: 49,152
                    Used Pages: 29,824
                      Pct Util: 60.7
                 Max. Pct Util: 60.7
              Physical Volumes: 5
             Buffer Pool Pages: 49,152
         Total Buffer Requests: 15,247,772
                Cache Hit Pct.: 99.86
               Cache Wait Pct.: 0.00
           Backup in Progress?: No
    Type of Backup In Progress: 
  Incrementals Since Last Full: 0
Changed Since Last Backup (MB): 34.42
            Percentage Changed: 29.55
Last Complete Backup Date/Time: 07/12/2004 23:25:05



            DB Full Percentage: 80
 DB Space Expansion Percentage: 100
           DB Expansion prefix: c:\tsmdata\server1\
   DB Maximum Size (Megabytes): 1,000
Last Update by (administrator): ADMIN
         Last Update Date/Time: 07/03/2003 16:18:12

           LOG Full Percentage: 80
LOG Space Expansion Percentage: 100
          LOG Expansion prefix: c:\tsmdata\server1\
  LOG Maximum Size (Megabytes): 1,000
Last Update by (administrator): ADMIN
         Last Update Date/Time: 07/03/2003 16:18:00

               Storage Pool Name: DISKPOOL
               Storage Pool Type: Primary
               Device Class Name: DISK
         Estimated Capacity (MB): 4.0
                        Pct Util: 0.2
                        Pct Migr: 0.1
                     Pct Logical: 100.0
                    High Mig Pct: 90
                     Low Mig Pct: 70
                 Migration Delay: 0
              Migration Continue: Yes
             Migration Processes: 1
               Next Storage Pool: 
            Reclaim Storage Pool: 
          Maximum Size Threshold: 4 M
                          Access: Read/Write
                     Description: 
               Overflow Location: 
           Cache Migrated Files?: No
                      Collocate?: 
           Reclamation Threshold: 
 Maximum Scratch Volumes Allowed: 
   Delay Period for Volume Reuse: 
          Migration in Progress?: No
            Amount Migrated (MB): 0.00
Elapsed Migration Time (seconds): 0
        Reclamation in Progress?: 
 Volume Being Migrated/Reclaimed: 
  Last Update by (administrator): ADMIN
           Last Update Date/Time: 07/13/2004 07:36:30
        Storage Pool Data Format: Native
            Copy Storage Pool(s): 
         Continue Copy on Error?: 
                        CRC Data: No

Thanks,

Tao Jiang
Coban Research and Technologies
12503 Exchange Drive Suite 536
Stafford, Tx, 77477
281-277-8288 Ext:112