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XX102-00-00 Rev 203 KOL-RAID3 RAID Storage Systemd
Installation
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11
Connecting the Null Modem Cable
Attach one end of the Null Modem Cable to a COM Port on your PC or Workstation. Attach the other end to the COM
Port on the Storage System .
Connecting the SCSI Cables
Installation of the Storage System disk array is very similar to the installation of a standard SCSI drive. The SCSI
connector accepts the standard 68-pin LVD SCSI connector used on most LVD SCSI devices. Refer to your system
and/or SCSI host adapter manual for additional installation procedures that may apply to your system or host adapter.
SCSI-IN
SCSI-OUT/TERM
Figure 5.
SCSI and COM Connectors on rear panel.
Caution
To prevent possible damage to the array or system, ensure that
system power is OFF before connecting the cables.
SCSI Cable Connection and Termination
Two 68-pin wide SCSI connectors are provided on the back of the enclosure for connecting the array to the system.
These connectors are used in one of two ways:
•
If the Storage System is the only external SCSI device, or is the last external device in a daisy-chained
configuration, connect the incoming cable (the one attached to the PC’s SCSI adapter) to the SCSI Input
Connector.
•
If the Storage System has internal SCSI termination (no external terminator was included), it will terminate itself
automatically.
•
If the Storage System does not have internal SCSI termination (an external terminator was included), attach the
external terminator to the SCSI Output Connector.
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If the array is to be placed in the middle of a daisy-chained configuration, attach the incoming cable (the one
which is attached to the SCSI adapter) to the SCSI Input Connector and attach the outgoing cable (the one
which continues on to other devices) to the SCSI Output Connector.
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No terminator is required at the unit. However, the last device in the daisy chain must be terminated, either
internally or by attaching an external terminator.
Correct SCSI termination procedures require that the first and last devices on the SCSI bus be terminated. If the first or
last device is not terminated, or if devices other than the first and last are terminated, erratic SCSI bus performance may
occur. Typically, the system or host adapter is the first device and is already terminated. When installing the unit disk
array on a SCSI bus with other devices, make sure the above rules are observed with all devices on the SCSI bus.
Consult your system and/or host adapter manual for additional information on correct termination procedure.
COM Port Connector
SCSI Input
Connector
SCSI Output
Connector