Health Report for an Exchange Server

Hi

I need your help. I need to know what means the follow errors:

DB 01 -  Could not determine server with active database copy
DB 01 -  unhealthy database copy count is 1 (of 1 )
DB 01 -  unhealthy content index count is 1 (of 1 )
DB 02  -  healthy copy/replay queue count is 2 (of 3 )
DB 03  -  unhealthy database copy count is 1 (of 3 )
DB 03  -  healthy copy/replay queue count is 2 (of 3 )
DB 04  -  healthy copy/replay queue count is 2 (of 3 )
DB 05  -  healthy copy/replay queue count is 2 (of 3 )
DB 06  -  healthy copy/replay queue count is 2 (of 3 )
DB 07  -  healthy copy/replay queue count is 2 (of 3 )
DB 08  -  healthy copy/replay queue count is 2 (of 3 )
DB 09  -  unhealthy database copy count is 1 (of 3 )
DB 09  -  healthy copy/replay queue count is 2 (of 3 )
DB 10  -  unhealthy database copy count is 1 (of 3 )
DB 10  -  healthy copy/replay queue count is 2 (of 3 )
DB 11  -  healthy copy/replay queue count is 2 (of 3 )
DB 12  -  healthy copy/replay queue count is 2 (of 3 )
DB 13 -  healthy copy/replay queue count is 2 (of 3 )
DB 14 -  healthy copy/replay queue count is 2 (of 3 )
DB 15 -  unhealthy database copy count is 1 (of 3 )
DB 16 -  healthy copy/replay queue count is 2 (of 3 )

Thanks