HP Surestore Tape Library Model 4/40 SAN Solution Installation Guide - Page 16

Switches, Bridges

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Topologies and Components Components • Multi-Port Hub - consists of 6 to 16 ports (copper or optical GBICs), network management software, and supports Fibre Channel Arbitrated Loop (FC-AL). Switches Switches are intelligent devices that are able to interconnect individual nodes, arbitrated loops, and other switch elements. Switches provide full bandwidth per port and high-speed routing of data via link-level addressing, as well as the following: • 8 to 16 ports (possibly more) • Copper or optical GBICs • Fast, non-blocking, dedicated bandwidth • Special services (time, name, etc.) • Integrated Simple Network Management Protocol (SNMP) and Management Information Base (MIB)-compliant management for remote management • Configuration management tools and utilization monitoring • Automated port isolation and device failover for fault-tolerance, along with N+1 hot-swappable components • Port Bypass Capability enables switches to deactivate bad ports Bridges The bridge provides connectivity between FC switched fabric or FC-AL to devices without FC ports. Bridges enable SCSI-based devices to be connected to FC SANs. FC-to-SCSI bridges are typically used to connect SCSI tape libraries and autoloaders to the SAN. A bridge can also be used to connect servers or workstations to the SAN in "initiator" mode. The FC specification allows for a 10km maximum end-to-end distance. A bridge may also provide: • Mapping of SCSI devices to units of a single AL-PA • A configurable mapping table • SNMP management • Extenders allow FC connections greater than 10km 1-6 Chapter 1

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Topologies and Components
Components
Chapter 1
1-6
•
Multi-Port Hub
- consists of 6 to 16 ports (copper or optical GBICs),
network management software, and supports Fibre Channel
Arbitrated Loop (FC-AL).
Switches
Switches are intelligent devices that are able to interconnect individual
nodes, arbitrated loops, and other switch elements. Switches provide full
bandwidth per port and high-speed routing of data via link-level
addressing, as well as the following:
•
8 to 16 ports (possibly more)
•
Copper or optical GBICs
•
Fast, non-blocking, dedicated bandwidth
•
Special services (time, name, etc.)
•
Integrated Simple Network Management Protocol (SNMP) and
Management Information Base (MIB)-compliant management for
remote management
•
Configuration management tools and utilization monitoring
•
Automated port isolation and device failover for fault-tolerance, along
with N+1 hot-swappable components
•
Port Bypass Capability enables switches to deactivate bad ports
Bridges
The bridge provides connectivity between FC switched fabric or FC-AL to
devices without FC ports. Bridges enable SCSI-based devices to be
connected to FC SANs.
FC-to-SCSI bridges are typically used to connect SCSI tape libraries and
autoloaders to the SAN. A bridge can also be used to connect servers or
workstations to the SAN in “initiator” mode. The FC specification allows
for a 10km maximum end-to-end distance. A bridge may also provide:
•
Mapping of SCSI devices to units of a single AL-PA
•
A configurable mapping table
•
SNMP management
•
Extenders allow FC connections greater than 10km