Dell PowerEdge 4200 Service Manual

Also see for PowerEdge 4200 Series: Rack installation Rack installation Installation guide User guide Installation and troubleshooting guide

Contents

Dell PowerEdge 4200 Service Manual Manual pdf 18 page image

1-8 Dell PowerEdge 4200 Systems Service ManualController host adapter card, the SCSI backplane board allows you to removeand insert hard-disk drives without shutting down the system. External hard-disk drives are not supported by the built-in SCSI controller.A built-in Adaptec 7860 Ultra/Narrow SCSI controller provides a SCSI inter-face via a 50-pin connector to the CD-ROM drive in the externally accessibledrive bay and to any other SCSI drives installed in the other two bays.SCSI Hard-Disk DrivesSix internally accessible hot-pluggable hard-disk drive bays are located underthe externally accessible drive bays at the front of the computer (see Figure 1-4). These bays can contain up to six 1- to 1.6-inch-high SCSI hard-disk drives(either Ultra/Wide or Ultra/Narrow).NOTE: The externally accessible drive bays at the front of the computer arenormally used for diskette drives, CD-ROM drives, and/or tape drives. Hard-disk drives should be installed in the SCSI hard-disk drive bays. For detailedinformation about installing externally accessible drives, see Chapter 4 of thismanual.SCSI Configuration GuidelinesAlthough SCSI devices are installed essentially the same way as other devices,their configuration requirements are different. To configure your SCSI sub-system, follow the general guidelines offered in the following subsections.SCSI ID NumbersEach device attached to the 7860 Ultra/Narrow SCSI host adapter must have aunique SCSI ID number from 0 to 7.When Narrow SCSI devices are shipped from Dell, the default SCSI ID num-bers are assigned as follows:• The computer’s built-in Ultra/Narrow SCSI host adapter is configuredthrough the BIOS as SCSI ID 7.• A SCSI CD-ROM drive (installed in an externally accessible drive bay) isconfigured as SCSI ID 5.• A SCSI tape drive (if installed) is configured as SCSI ID 6.NOTE: There is no requirement that SCSI ID numbers be assigned sequentially orthat devices be attached to the cable in order by ID number.Devices attached to the Ultra/Wide SCSI host adapter need no ID settings or ter-mination; ID settings and termination are handled automatically by the SCSIbackplane.Device TerminationSCSI logic requires that termination be enabled for the two devices at oppositeends of the SCSI chain and disabled for all devices in between. Therefore,