HYDME1131W All available storage cells in the attached physical library have been used.

Explanation

When all available storage cells in the attached physical library have been used, the library enters the All Storage Cells Full state. With physical tape library Automated Library Manager Support (ALMS), the slot count is virtual and may not correspond to the actual physical slot count within the library. If all slots in the virtual slot count are used, The All Storage Cells Full state can result even if physical slots are still available.