Dell PowerEdge SC1420 - Manual (Page 58)

drive, follow the guidelines in the following subsections.
SCSI Interface Cables
SCSI interface connectors are keyed for correct insertion. Keying ensures that the pin-1 wire in the cable connects to pin 1 in the connectors on both ends.
When you disconnect an interface cable, take care to grasp the cable connector, rather than the cable itself, to avoid stress on the cable.
SCSI ID Numbers
Each drive attached to a SCSI controller must have a unique SCSI ID number from 0 to 15.
l The SCSI hard drive from which the system boots is configured as SCSI ID 0.
l If you install an additional SCSI drive or change your SCSI configuration, see the documentation for each SCSI drive for information on setting the
appropriate SCSI ID number.
SCSI Device Termination
SCSI logic requires that termination be enabled for the two drives at opposite ends of the SCSI chain and disabled for all drives in between. For internal SCSI
drives, termination is configured automatically. See the documentation provided with any optional SCSI drive you purchase for information on disabling
termination.
Configuring the Boot Drive
The drive or device from which the system boots is determined by the boot order specified in the System Setup program. See "Using the System Setup
Program" in your User's Guide. To boot the system from a hard drive or drive array, the drive(s) must be connected to the appropriate controller:
l To boot from a SCSI hard drive, the drive must be connected to the optional SCSI controller card. See the documentation that accompanied the
controller card.
After you open and close the cover, the chassis intrusion detector, if enabled, causes the following message to appear on the screen at the next
computer start-up:
ALERT! Cover was previously removed.
l Reset the chassis intrusion detector by changing Chassis Intrusion to Enabled or Enabled-Silent.
Front-Panel Inserts
If you are installing a new 5.25-inch drive, remove the front-panel inserts to allow external access to the drive. To gain access to the front-panel insert, you
might need to remove a device.
1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
2. Open the system. See " Opening the System " in "Troubleshooting Your System."
3. If applicable, remove a device. See the appropriate removal procedure.
4. Squeeze the insert tabs until the insert pops free of the front-panel cover. See Figure 7 -2 .
NOTE: SCSI devices installed by Dell are configured correctly during the manufacturing process. You do not need to set the SCSI ID for these drives.
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that drives be attached to the interface cable in order by ID number.
CAUTION: Only trained service technicians are authorized to open the system cover and access any of the components inside the system. See
your System Information Guide for complete information about safety precautions, working inside the computer, and protecting against
electrostatic discharge.