Technical data

Gigabit Interface Converter (GBIC) transceiver-based port connections
for maximum application flexibility. The hub is hot pluggable and is
unmanaged.
• Only single-hub arbitrated loop configurations are supported; that is,
there are no cascaded hubs on any SCSI bus.
• The only Fibre Channel switches supported are the DS-DSGGA-AA/AB
8/16 port, DS-DSGGB-AA/AB 8/16 port, or DS-DSGGC-AA/AB 8/16 port
Fibre Channel switches.
• The DSGGA, DSGGB, and DSGGC Fibre Channel switches and the
DS-SWXHB-07 hub support both shortwave (GBIC-SW) and longwave
(GBIC-LW) Gigabit Interface Converter (GBIC) modules. Seven of the
eight DSGGC-AA ports are fixed shortwave optical transceivers. Only
one DSGGC-AA port is configured as a removable GBIC. It may be
shortwave or longwave.
The GBIC-SW module supports 50-micron, multimode fiber cables with
the standard subscriber connector (SC) connector in lengths up to 500
meters (1640.4 feet). It also supports 62.5-micron multimode fiber
cables in lengths up to 200 meters (656.2 feet). The GBIC-LW supports
9-micron, single-mode fiber cables with the SC connector in lengths up to
10 kilometers (6.2 miles).
The KGPSA-BC/CA PCI-to-Fibre Channel host bus adapters and the
HSG60 and HSG80 RAID controller support the 50-micron Gigabit Link
Module (GLM) for fiber connections. Therefore, only the 50-micron
multimode fiber optical cable is supported between the KGPSA and
switch (or hub) and the switch (or hub) and HSG60 or HSG80 for cluster
configurations. You must install GBIC-SW GBICs in the Fibre Channel
switches (or hub) for communication between the switches (or hub) and
KGPSA or HSG60/HSG80.
• Tru64 UNIX Version 5.1A allows up to 255 Fibre Channel targets. An
active host port or host bus adapter constitutes a target.
• Tru64 UNIX Version 5.1A allows up to 255 logical unit numbers (LUNs)
per target.
• The HSG60 and HSG80 supports transparent and multiple-bus failover
mode when used in a TruCluster Server Version 5.1A configuration.
Multiple-bus failover is recommended.
• A storage array with dual-redundant HSG60 or HSG80 controllers in
transparent mode failover is two targets and consumes four ports on a
switch. Transparent mode is recommended only while upgrading from
Tru64 UNIX Version 4.
x. After the upgrade is complete, you should
switch to multiple-bus failover.
2–8 Hardware Requirements and Restrictions