At the front of a 2104 Model TU3 are 14 device slots
1
. Each slot must contain
either an SCSI disk drive module, or a dummy module. Each disk drive module
connects to a backplane that is mounted vertically about halfway between the front
and back of the 2104 Model TU3.
Note:
To run I/O at least one SCSI disk drive module must be present in each
2104 Model TU3.
The 14 device slots are split into two groups of seven slots. Between the two
groups of slots, there is a SCSI bus bridge card
2
. The SCSI bus bridge card
assigns the disk drive modules to a SCSI bus, in accordance with the setting of the
SCSI bus split switch on the switch card
5
.
On the back of the backplane are connectors for two fan-and-power-supply
assemblies
3
, two SCSI interface cards
4
, and a switch card
5
.
The 2104 Model TU3 can have either two fan-and-power-supply assemblies or one
fan-and-power-supply assembly and one fan assembly. Either option provides all
the necessary power and cooling for the 2104 Model TU3.
It is better, however, to have two fan-and-power-supply assemblies, rather than
one fan-and-power-supply assembly and one fan assembly, because then the
amount of power required from each power supply is reduced, and, if one power
supply fails, power for the 2104 disk enclosure continues to be supplied by the
other power supply.
The SCSI interface cards
4
are used to connect host machines to the 2104 Model
TU3. These cards contain logic that provides information about what is happening
in the 2104 Model TU3, and controls the operation of the subsystem.
The switch card
5
contains switches that control which SCSI bus mode is selected,
how the 2104 Model TU3 is supplied with power, and what enclosure services are
enabled. It also contains a rotary switch that is used to set the ID of the 2104
Model TU3.
Options for configuring a 2104 Model TU3 are described in the
Expandable Storage
Plus: 2104 Model TU3 Installation Guide
.
Chapter 1. Using the 2104 Model DU3 or TU3
5
Summary of Contents for TU3 2104
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