Chapter 1
Sun StorEdge D2 Array Overview
1-11
1.7.1
ESM
The Ultra3 SCSI Environmental Services Module (ESM) is shown in the following
figure.
FIGURE 1-5
ESM Front (Viewed from the Back of the Array)
describes the connectors, switches, and LEDs on the ESM.
TABLE 1-5
Connectors, Switches, and LEDs on the ESM
SCSI-
X
connector
The two host connectors on each ESM enable the array to connect to two separate
hosts. External terminators are not required. Termination power is sensed through the
SCSI
N
Termination Power LED.
SCSI-
X
Termination
Power LED
Green: Termination power is being supplied from the host to the associated connector.
Configuration
Options switch bank
Four-position, piano-style switches to set options described under “Configuration
Options Switch Bank” on page 1-14.
D2
SCSI-A
SCSI-B
4 3 2 1
Configuration
Options
Unit ID
SCSI
SCSI-B connector
SCSI-A connector
SCSI-A Termination Power LED
Configuration Options switch bank
Power On/SCSI Active LED
SCSI-B Termination Power LED
ESM Over Temperature/Code Download LED
Unit ID
Содержание StorEdge D2
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