Set it and Forget it! The drive will request cleanings based on either exceeding the amount of motion hours between cleanings (clean periodic) or based on an increase read/write error rate (clean now). Once the cleaning media has exceeded the # of allowed mounts per its spec it will report expired ( I believe it is 50 mounts-I'm not 100% on that #). The next time the media is inserted the drive will reject the media w/ the Expired Cleaning cartridge message. The tape has a cartridge memory that keeps track of how many times it has been mounted. Not sure if there is a log entry in the 124T for autoclean or not, but you will know it is not working when you get a manual message either via the library or the ISV s/w stating that the drive needs cleaning.   Hope this helps... Bob  
I've had a T-124 Powervault now for little over a year.When we put it into service I inserted a Cleaning Tape into slot #8, set it to automatic and so far I guess it's been cleaning. I can't find anything in logs to say it cleaned.  I'm not getting any errors but because I don't know how often it's running I don't know when I'm due to replace the cleaning tape. How often does the cleaning operation run when set to automatic? Is there a way to tell the number of cleanings that have happened? Any suggestions would be appreciated.
T-124 PowerVault Cleaning Automatic