How to check no. of times tape has been full.

Hi All,

we are using Symentec Netbackup 7.0.1 with LTO4 & LTO5 Tapes, our master server runs on HP_UX OS, I want to know that is there any way to know that how many times tape has been full from start of time of a specific tape, as i want to change the Tapes before its end of life cycle to avoid any disaster. 

For.e.g :- i want to know the no. of times Tape01 has been full from its 1st use.

Thanks in Advance.