IBM DR550, Руководство по диагностике и обслуживанию, Страница: 89 / 258

Chapter 8. IBM TotalStorage DR550 SAN Fibre Channel switch
This section provides information about the DR550 Storage Area Network switch,
such as explanations of controls and indicator lights.
Note: The DR550 SAN Fibre Channel Switch is not supported with model DR1.
Two IBM System Storage SAN Fibre Channel Switches are used to interconnect
both DR550 SSAM Server servers with the DR550 Storage Controllers to create a
SAN (dual node configurations). Tape attachment can be done using the additional
ports on the switches. The DR550 SAN Switches build two independent SANs,
which are designed to be fully redundant for high availability.
For the single node configurations, only one DR550 SAN Switch is included. This
creates a single independent SAN and can be used for both disk and tape access.
The DR550 SAN Switch is a 16-port, dual speed, auto-sensing Fibre channel switch.
Eight ports are populated with 4 gigabit shortwave transceivers when the DR550 is
configured in an non Enhanced Remote Mirror (ERM) configuration. Twelve ports
are populated with 4 gigabit short wave transceivers when the DR550 is
configured for enhanced remote mirror when the distance between the SAN switch
and the first component in the network is less than 300 meter. Twelve ports are
populated with 4 gigabit shortwave transceivers and four ports are populated with
4 gigabit long wave transceivers when the distance between the SAN switch and
the first component in the network is greater than 300 meters. This dual
implementation is designed to provide a fault tolerant fabric topology, to help
avoid single points of failure.
Each switch in the DR550 comes pre-zoned by ports. Both switches are configured
with distinct zones as illustrated in the cabling diagrams.
Switch characteristics
The following sections describe the physical characteristics of the switch.
Port side of the DR550 SAN switch
Figure 10 on page 62 shows the port side of the switch. The serial port, Ethernet
port, and the Fibre Channel ports are all located on this side of the switch. All
LEDs are also located on the port side of the switch. These LEDs display the
system status, power status, port status, and port speed. See “Interpreting LED
activity” on page 62 for a complete description of the locations and interpretations
of these LEDs.
The switch enclosure has forced-air cooling, with the fans pushing the air from the
non-port side of the chassis through the enclosure, and exhausting through the
holes on the port side. Three dual speed fans provide the cooling for the switch.
© Copyright IBM Corp. 2008
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