Physical and logical addresses of drives
The library assigns each tape drive a unique address to indicate its physical and logical location.
The library assigns each tape drive a unique address to indicate its physical location, which is shown in
Figure 19 on page 17. The physical numbering is bottom up on all drives. This information is shown on
the Drives page of the Management GUI.
Figure 19. Physical numbering of drives
The library assigns each tape drive a SCSI element address that consists of a value that denes a logical
location in the library to the SCSI interface. It is assigned and used by the application when the host
server processes SCSI commands. The SCSI element address for a drive is unique to the location of the
drive. It does not vary based on other drives in the library. See “Library partitioning” on page 72.
Drive features
Media optimization
Media optimization is a new feature for the LTO9 tape drive with L9/LZ media.
The increased number of tracks used to write data on tape requires greater precision. Media optimization
creates a referenced calibration for each cartridge that enables the tape drive’s intelligent alignment to
optimize data placement. LTO-9 media optimization enhances LTO tape long-term media durability.
It is important to consider when media optimization will be performed:
• Media optimization will be performed on rst load of L9/LZ media during initialization.
IBM Condential
Chapter 1. Overview17
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