In Exchange 2010 Dag Environment ,even after enabling of circular logging ,logs are not getting purged.

Backup is completed successfully with no error but logs are not purged after this so tried to do this with circular logging but logs are not getting purged..

Journaling database along with other are mounted and are in healthy state.There are no logs in copy queue length and replay queue length.

Dismounted and mounted the database and restarted the servers as well but still the issue persists.

Please provide some solution.