Chapter 1 Introduction
Background Information About SCSI
DLT-S4 Interface Reference Guide
3
Fibre Channel
Characteristics
1
The features of the DLT-S4 Fibre Channel implementation include:
• Automatic speed negotiation, with transfer rates of:
• 100 megabytes per second (1 Gb/second)
• 200 megabytes per second (2 Gb/second)
• 400 megabytes per second (4 Gb/second)
• Automatic topology negotiation (the tape drive operates as an
NL_Port or N_Port):
• Arbitrated Loop: private loop, NL_Port to NL_Port(s)
• Arbitrated Loop: public loop, NL_Port to NL_Port(s) and one
FL_Port
• Fabric attachment: N_Port to F_Port
• Point-to-Point attachment: N_Port to N_Port
• FCP-2 compliant
• Class 3 level of service
• Basic and extended link services
• Task retry identification
• Hard assigned port addresses, when attached to a library. The library
can assign a hard address to the tape drive. If the library does not
assign a hard address, the tape drive takes a soft address initially.
• The DLT-S4 tape drive does not act as an initiator on the SCSI bus.
Therefore, the drive does not:
1
Generate unsolicited traffic on the bus
2
Initiate its own SCSI commands
3
Assert bus reset.
World-wide Names
1
Although, the DLT-S4 tape drive contains one 64-bit world-wide name
for the port and one for the SSC logical unit (LUN-0), the FCP-2 standard
allows for the use of the same world-wide name for the node as is used in
LUN-0. The drive reports the world-wide names to the host through the
INQUIRY Command (12h)
on page 34.
