Scsi Requirements; Installing 5.25-Inch Peripherals In The Front Bays - Silicon Graphics 1400 Server Family Maintenance And Upgrade Manual

Chapter 1: Working Inside the System
14

SCSI Requirements

One narrow and two wide SCSI cables are standard in the system.
All SCSI devices must be unterminated except the peripheral at the end of the SCSI cable.
Hard drives usually provide an active termination, while CD-ROM drives do not.
Because we recommend putting hard drives only in the internal bays, this means that
you should route the SCSI cable so that the last device on the cable is a hard drive in the
internal bay.

Installing 5.25-inch Peripherals in the Front Bays

Three 5.25-inch half-height bays provide space for tape backup, CD-ROM, or other
removable media drives. Note that system EMI integrity and cooling are both protected
by having drives installed in the bays or filler panels and EMI shields covering the bays.
When you install a drive, save the panel and shield to reinstall in case you should later
remove the drive and not reinstall one in the same bay.
To maintain compliance with electromagnetic compatibility (EMC) regulations, the
5.25-inch bays must be configured with either:
• An EMC-compliant 5.25-inch peripheral device, OR
• A metal cover plate
Caution: The internal SCSI interface in this system supports only single-ended SCSI
devices on the narrow SCSI channel. Connecting differential SCSI drive types to this
interface can result in electrical damage to the baseboard and peripherals.
We recommend that you do NOT install any hard disk drives in the 5.25-inch bays. The
drives cannot be properly cooled in these locations.