Users Guide

normally configured as SCSI ID 6, but can be confgured to any unused SCSI ID.
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the
cable in order by ID number.
SCSI devices installed by Dell are configured correctly during the manufacturing process. You do not need to set the
SCSI ID for these SCSI devices.
If you attach additional optional SCSI devices, refer to the documentation that came with each device for information
about setting the appropriate SCSI ID number.
CAUTION: Dell recommends that you use only SCSI cables purchased from Dell. SCSI cables purchased
elsewhere are not guaranteed to work with Dell PowerEdge 1300 systems.
Device Termination
SCSI logic requires that termination be enabled for the two devices at opposite ends of the SCSI chain and disabled for
all devices in between. However, because both SCSI controllers are self-terminating and because all internal SCSI
cables provided by Dell have active termination at the end of the cables, any SCSI devices you install should have
termination disabled on the devices.
Furthermore, when attaching external SCSI devices, you should use only external SCSI cables with active termination
on the cable. When used with this type of cable, all external SCSI devices also need to have termination disabled on the
devices.
See the documentation provided with any optional SCSI device you purchase for information on disabling termination
on the device.
SCSI Cables
The 68-pin (internal) SCSI cable in your system connects SCSI devices (normally SCSI hard-disk drives) to the
integratead 7890 Ultra2/Wide LVD controller.
The connector at the end of the cable attaches to the Ultra2/Wide LVD primary SCSI controller connector labeled
"SCSI_ULTRA2" on the system board.
The other connectors on the cable are used for attaching up to four SCSI hard-disk drives in the internal drive
bays (see Figure 11, SCSI Cable). When the integrated SCSI controller is not being used for hard-disk drives, it
can be attached to a SCSI tape drive.
Refer to the documentation that came with the external SCSI device for information on how to connect the device, set
its SCSI ID, and disable termination.
Figure 11. SCSI Cable