Using Isweries Navigator – Go system – Configuration and Service – Hardware – Tape Devices – Tape Libraries – usually(TAPMLB01) – Cartridges
Right click on Volume Properties change Ejected to Not Shared
To avoid Tapes (Cartridges) from being ejected you need to look at the Move Policy that the Backup uses. Normally as soon as a tape is Active it is eligable for Move. Assign a Move Policy that does not imply a move out of the Tape Library.