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en | Subsystem Connection and Operation
RAID Subsystem DVA-08K | Installation Manual
F.01U.027.797 | V1 | 2006.05
Bosch Security Systems
from a reputable manufacturer. To ensure optimum performance, it is necessary to use
proper, high quality SCSI-320 compatible cables. Failure to do so will result in downgraded
performance.
5.2.2
SCSI Port on the Controller Rear Panel
•
The SATA-based subsystem is equipped with two dual-stacked connectors on the back of
the enclosure. Each dual-stacked connector comes with two 68-pin VHDCI ports that is
specified as a “Channel # In” or “Channel # Out” port.
The SCSI ports are specified as “In” or “Out” for ease of identification. As long as each
device on a SCSI bus is assigned with a unique ID and the SCSI bus properly terminated,
there are no limitations with connecting a specific SCSI port to the host- or drive-side
devices.
Fig. 5.1
Dual-stacked Connectors on the Controller Faceplate
•
The subsystem requires an external VHDCI-to-VHDCI SCSI round cable to connect the
subsystem to a host adapter.
•
One (1) audio-jack-to-DB9 cable is provided to facilitate the connection of the COM1 port
for local terminal emulation access to the array.
•
Two (2) power cords are provided for the power connections to the power sources.
•
The RJ-45 Ethernet cable for network management connection is a user-supplied item.
Use straight-through Ethernet cables with RJ-45 plugs.
5.2.3
SCSI Termination
Correct SCSI termination procedures require that the last device on the SCSI bus be termi-
nated. 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 DVA-08K. 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 recom-
mended, 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 Bosch RAIDWatch manage-
ment software, the auto-detection function is also disabled.
Typically, the host computer or host adapter (SCSI card inside the PC) is the first device and
some are already terminated. When installing the DVA-08K 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 pro-
cedures.
i
NOTICE!
It is recommended not to change the firmware default setting for the SCSI terminator so the
auto-detection function can operate.
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