Qualstar XLS Series Installation Manual page 121

Example 4: Logical Library with Multiple Hosts
Figure 8-8
Figure 8-8 Example 4: Logical library with multiple hosts (view from the back of the LRM)
In the example:
• Host 1 is connected to one of the HBA ports in the system controller, and it
controls the medium changer interface for the logical library.
• Hosts 2, 3, and 4 share access to the 16 tape drives but are not connected to the
medium changer interface.
• Hosts 2, 3, and 4 are connected to Host 1 across an Ethernet network and
communicate using specialized storage management software. The software
enables Hosts 2, 3, and 4 to send requests to move media to Host 1. Host 1, in
turn, manages and prioritizes the requests, issues the appropriate commands to
the medium changer, and returns status to the other hosts.
XLS Library Installation Manual
shows an example logical library connected to four host computers.
Logical Library 1
8
Hosts 2, 3, & 4
share access to
all 16 tape drives
A B C D
Host 1 controls
the medium
changer for
Hosts 2, 3, & 4
Installing the Tape Drive Assemblies
The hosts
communicate
over Ethernet
8-9