Issuing this command doesn't delete any vol historys for dbsnapshots

tsm: TSMPOK_SERVER1>del volh type=dbsnapshot todate=today-6

Do you wish to proceed? (Yes (Y)/No (N)) y
ANR2467I DELETE VOLHISTORY: 0 sequential volume history entries were 
successfully deleted.


tsm: TSMPOK_SERVER1>q volh t=dbs

                                 Date/Time: 05/24/2013 05:11:32
                               Volume Type: DBSNAPSHOT
                             Backup Series: 9
                          Backup Operation: 0
                                Volume Seq: 10,001
                              Device Class: NBGCLASS
                               Volume Name: TSMNBG.DSS.369386678
                           Volume Location: TSMNBG
                                   Command:
                   Database Backup ID High: 0
                    Database Backup ID LOW: 0
             Database Backup Home Position: 0
                       Database Backup HLA:
                       Database Backup LLA:
    Database Backup Total Data Bytes (MB) : 0
     Database Backup total Log Bytes (MB) : 0
            Database Backup Block Num High: 0
             Database Backup Block Num Low: 0
                 Database Backup Stream Id: 1
Database Backup Volume Sequence for Stream: 10,001


Thanks,

Tim Brown
Supervisor Computer Operations
Central Hudson Gas & Electric