Ch 3: Installing Optional Devices
Daisy Chain and Terminating Resistor
A maximum of seven SCSI devices can be serially connected to one SCSI controller. Such a serial connection is referred to as a daisy chain connection. The SCSI devices at both ends of the daisy chain require a resistor called a terminator (terminating resistor). If you attach a terminator onto another SCSI device, that SCSI device will not operate normally.
In Hitachi PC VisionBase 8450H/R Server, up to six SCSI devices can be connected to one controller.
NOTE: A terminating resistor is installed for the following devices supplied as standard in the Hitachi PC VisionBase 8450H/R Server: the SCSI controller, the disk array controller board, and the platter board on which internal hard disks are to be installed.
In Hitachi PC VisionBase 8450H/R Server you need not mount a terminating resistor onto removable devices; the SCSI cable to be connected already has one mounted.
SCSI device
SCSI IDs
A terminating resistor is mounted here
SCSI board
(a terminating resistor is mounted)
SCSI cable
Daisy chain image
SCSI IDs are numbers used to identify SCSI devices; 0 to 6 are used. Make sure that 0 is used for the SCSI ID for your starter hard disk. Be sure to set SCSI IDs so that there is no duplication within the group of SCSI devices (those within the same daisy chain) connected with the same SCSI controller.
If the same SCSI ID is used the more than one SCSI device in a group of SCSI devices connected to the same SCSI controller, the SCSI devices will malfunction.
NOTE: The SCSI ID for the SCSI controller is set to 7.
Hitachi PC VisionBase 8450H/R Server | 49 |
