SCSI Element Addressing

The SCSI element address depends on the element type.

Each library or partition uses a fixed starting address for each element type. Then, within each element type, the element addresses are sequential. You can use the GUI to view the element ID for a particular cell in the library (see SL4000 Library Guide).

Element Type	Starting SCSI Element Address
Medium Transport Element (Robot)	0
Import/Export Elements (CAPs and AEMs)	10
Data Transfer Elements (Drives and Empty Drive Slots)	1000
Storage Elements (Cartridge Cells)	2000

Empty Drive Slot Element Addressing

Unlike the SL3000, the SL4000 library assigns a SCSI element address to empty drive slots. Therefore, removing or adding a drive tray will not cause the library to renumber the data transfer element addresses.

If you send a Read Element Status (B8h) command for an empty drive slot, the library will return an Element Descriptor with the slot marked as disabled with an exception. The library sets the ASC/ASCQ to 3Bh/1Ah indicating an empty drive slot.