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The external labels on the cartridges identify the cartridges to the 3494. Host
control software in some operating environments requires that internally written
labels on volumes correspond to external volsers. IBM recommends that
correspondence of external and internal cartridge labels be verified by library control
software as part of mount processing. Cleaner cartridges must also have operator
and machine-readable external labels to identify each cartridge.
High Performance Cartridge Tapes (HPCT) managed by the VTS are automatically
checked for the correct internal volume label and re-labeled if necessary.
Figure 17 shows the possible labeling configurations of the tape cartridges and
Table 1 shows how the library handles the different types of labeling configurations.
Table 1. Cartridge Tape Labeling (Media type default set to Cartridge System Tape)
Cartridge Type Color
Media-Type
Label Handled as:
1 Cartridge System Tape Gray Not present Cartridge System
Tape(default, see note)
2 Cartridge System Tape Gray Present (1) Cartridge System Tape
3 Enhanced Capacity
Cartridge System Tape
Gray and
white
Not present Cartridge System
Tape(default, see note)
4 Enhanced Capacity
Cartridge System Tape
Gray and
white
Present (E) Enhanced Capacity
Cartridge System Tape
5 High Performance
Cartridge Tape
Black with
blue leader
block and
identification
notches
Present (J) High Performance Cartridge
Tape
Note: The default could be Enhanced Capacity Cartridge System Tape or High
Performance Cartridge Tape instead of Cartridge System Tape; refer to “Operational Status”
on page 111.
Gray
White
Gray
White
Black
Gray
Gray
Blue
A06O
0002
Figure 17. Cartridge System Tape Labels
Chapter 1. Introduction 21