Technical data

• The DSGGA, DSGGB, and DSGGC Fibre Channel switches 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-CA PCI-to-Fibre Channel host bus adapter 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-optic cable is supported between the KGPSA and switch and
between the switch and HSG60 or HSG80 for cluster configurations.
You must install GBIC-SW GBICs in the Fibre Channel switches for
communication between the switches and KGPSA or HSG60/HSG80.
• 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.
• For other Fibre Channel restrictions, see the hardware requirements
and restrictions chapter in
Cluster Hardware Configuration.
2.2.3 Memory Channel Restrictions
The Memory Channel interconnect is one method used for cluster
communications between the member systems.
Ensure that you abide by the following Memory Channel restrictions:
• The AlphaServer ES45 systems only support Memory Channel 2 (MC2)
hardware.
• The Memory Channel adapter is a 5V 33-MHz module and is restricted to
PCI bus 0 (slots 3, 6, 9, and 10). Installing a redundant Memory Channel
adapter places both Memory Channel adapters on the same PCI bus.
• If redundant Memory Channel adapters are used with an ES45, they
must be jumpered for 128 MB and not the default of 512 MB. If there is
only one Memory Channel adapter on the PCI bus, it may be jumpered
for 512 MB.
• An ES45 system with dual Memory Channel adapters cannot be
added to an existing cluster that has Memory Channel adapters
jumpered for 512 MB. The ES45 cannot join the cluster. The
Hardware Requirements and Restrictions 2–5