Using multiple cleaning tapes successively

Dear all,

when using multiple cleaning tapes they will be automatically selected by NetBackup in alternating order (e.g. CLN001 - CLN002 - CLN001 - etc.) upon request. Therefore, the usage count will increase equally and all the tapes will have no cleaning cycles left at nearly the same time.

So, leaving the system unattended for a couple of days might cause a tape drive going down due to unsatisfied cleaning requests. How to avoid that - is there a setting which forces NetBackup to use one cleaning tape first, till it has no cycles left, and then the next one (i.e. one after another)?