Logs database or directory, where are it stored ?

F5 save the logs on /var/log directory and, by default, only for the last 8 days. I know that we can change this value ( 8 days) for (0-100 days) but when i open a qview, it show us logs oldest than 8 days, so i guess that F5 saves this older logs on a diferent database or am i wrong? If this is true, where is the directory to find this logs?