Bull Cedoc Bull Escala 2104 DS4, Руководство оператора

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At the front of a 2104 Model TS4, there are 14 device slots
1
. Each slot must
contain either a SCSI disk drive module or a dummy disk drive module. Each disk
drive module connects to a backplane that is mounted vertically about halfway
between the front and back of the 2104 Model TS4.
Note: To run I/O, at least one SCSI disk drive module must be present in each
2104 Model TS4.
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 back of the backplane are connectors for two fan-and-power-supply
assemblies
3
and two SCSI Interface cards
4
.
The 2104 Model TS4 has 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 TS4.
Having two fan-and-power-supply assemblies is better than one
fan-and-power-supply assembly and one fan assembly, because then the amount of
power required from each power supply is reduced. If one power supply fails, power
for the 2104 Model TS4 disk enclosure continues to be supplied by the other power
supply.
The SCSI Interface cards
4
connect the host machines to the 2104 Model TS4.
These cards contain logic that provides information about what is happening in the
2104 Model TS4, and controls the operation of the subsystem.
The SCSI Interface cards
4
contain switches that control:
v
Which SCSI bus mode is selected
v How the 2104 Model TS4 is supplied with power
v
What enclosure services are enabled
The SCSI Interface cards also contain a rotary switch that you use to set the ID of
the 2104 Model TS4.
For options about how to configure a 2104 Model TS4, see the Expandable Storage
Plus: 2104 Model TS4 Installation Guide .
Chapter 1. Using the 2104 Model DS4 or Model TS4
5