Storage element (storage slot) addresses

Storage slots are virtualized by dynamically associating element addresses to them, as required. An element address is associated with a storage slot that is selected by the library as cartridges are moved and inventoried. In the case of a storage element that is empty due to a move, that source element address is unassociated. Association of storage element addresses is accomplished in a way that is transparent to the application software.

The first storage element address of any logical library is equal to 1024 plus the logical library number. For example, logical library 3 has a starting storage element address of 1027 (X'403').

You can select the number of storage element addresses for a logical library (as reported to the host application software by the SCSI Mode Page X'1D') by changing the Maximum Number of Cartridges setting for that logical library through the web user interface. For each logical library, the default value for Maximum Number of Cartridges is the number of accessible storage slots that are installed in the library for that cartridge type at the time the logical library is created. You can change the Maximum Number of Cartridges setting for each logical library, but the value must always be greater than or equal to the number of actual cartridges that are currently assigned to that logical library. It is possible to set Maximum Number of Cartridges to a value that is higher than the number of accessible storage slots that are installed at the time to allow future library capacity expansion to be transparent to the host application software. However, application performance might degrade slightly due to the greater number of addresses. Take care not to exceed the license limitations of the host application software.