Qualstar XLS Series Installation Manual page 190

12.1 About Physical and Logical Libraries
• Logical Libraries 1 and 3 have been assigned one and three I/O ports,
respectively; Logical Library 2 does not have an assigned I/O port.
Important:
• The software applications and the host computers connect to and communicate
with the tape drives independently of the medium changer.
Physical Library
Logical
Library 2
Logical
Library 1
Tape Drive Tape Drive
Tape Drive Tape Drive
Tape Drive Tape Drive
Tape Drive Tape Drive
I/O I/O
Port Port
I/O I/O
Port Port
Medium Changer Interface and
Robotics
Figure 12-1 Relationship between the physical library, logical libraries, and software applications
12-2
The 10 slots in a single I/O port cannot be shared among
logical libraries. If a logical library needs access to an
I/O port, it must be assigned the entire port when the
library is defined.
Logical
Library 3
Tape Drive Tape Drive
Tape Drive Tape Drive
Tape Drive Tape Drive
Drive
Tape Tape Drive
System
Controller
HBA
HBA
HBA
Resources owned by
Logical Library 1
Resources owned by
Logical Library 2
Resources owned by
Logical Library 3
Resources shared by all
logical libraries
to Logical Library 3 tape drives
to Logical Library 2 tape drives
to Logical Library 1 tape drives
Host Computer 1
Software Application 1
Control
Host Computer 2
Paths to
Software Application 2
Medium
Changer
Host Computer 3
Software Application 3
Control and
Data Paths to
Tape Drives
501601 Rev. 07-01-19