Q24
Tape
Library
Installation
and
Operations
Manual
© Copyright QUALSTAR 2014
6
A SAS tape drive is identified by a unique identifier called a World Wide Name (WWN) or World Wide
Identifier (WWID). The library assigns the WWID to the drive bay. When a tape drive is replaced, the
WWID is re‐assigned to the new tape drive.
The operating system tracks the WWID for the tape drive on each HBA channel. Each of the drive
connectors on the fan‐out cable is associated with an HBA channel. Once a tape drive has been plugged
in, it should remain on the same channel to retain the association between the HBA channel and
WWID.
2.3
Fibre
Channel
Requirements
Fibre Channel (FC) allows an active intelligent interconnection scheme, called a Fabric , to connect
devices. Everything between the ports on FC is called the Fabric. The Fabric is most often a switch or
series of switches that takes the responsibility for routing.
The
library
allows
the
selection
of
the
following
Fibre
Channel
port
behaviors:
LN Port (default setting) – an automatic configuration that tries arbitrated loop first, then switched
Fabric.
Figure
7
Fibre
Channel
topology
(LN
Port)
