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EonStor A12U/A08U-G2421 Installation and Hardware Reference Manual
Figure 4- 1: SCSI Connectors on the Controller Rear Panel
4.1.3 SCSI Termination
Correct SCSI termination procedures require that the last device on the SCSI bus be
terminated. If the last device is not terminated or if devices other than the last are
terminated, erratic SCSI bus behavior may occur.
An auto-detection, on-board terminator is built into the A08/12U-G2421. You do not
need to install an external terminator when a subsystem acts as the last device in the
daisy chain configuration. The on-board terminator default is enabled. If the
subsystem is not the last device in the daisy chain configuration, the terminator will
be automatically disabled. Although it is not recommended, if you prefer to disable
the firmware setting for the on-board terminator using the LCD keypad panel on the
subsystem, RS232C terminal session, or RAIDWatch management software, the
auto-detection function is also disable.
Typically, the host computer or host adapter (SCSI card inside the PC) is the first
device and some are already terminated. When installing the A08/12U-G2421 on a
SCSI bus with other devices, be sure to observe the above rules regarding all devices
on the SCSI bus. Consult your host computer and/or host adapter manual for
additional information on correct termination procedures.
NOTE:
Leave the firmware default setting for the SCSI terminator so the auto-detection
function can be operated is recommended.
SCSI Connection Overview
4-2