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System Overview 1-19
The backplane has two main functions: SCSI drive control and system data
logging. Drive status is monitored to detect failing drives and to control LED
indicators. The backplane features include the following:
„
insertion and removal of hard drives while power is on (referred to as
“hot swap”)
„
simplified cable management
„
SCA connectors to simplify inserting and removing hard drives
„
SCSI management of fault LEDs.
Each backplane supports SCSI drives with SCA connectors.
Removable Media Drive Bays
On the upper left side of the system, four 5 1/4-inch half-height bays (see
Figure 1-10) are designed for peripherals with removable media (diskette, CD-
ROM, tape). Two available adjacent 5 1/4-inch bays can be converted to a
single full-height bay. The 5 1/4-inch drives can be removed directly from the
front of the chassis. Removal of the system top cover may be required to
install/remove the device cables. Cosmetic filler panel are installed over all
unused 5 1/4-inch bays.
Factory-installed CD-ROM reader plus
three bays for removable media
drives.
Factory-installed 3 1/2-inch diskette
drive plus second bay for removable
3 1/2-inch drive.
(Exterior doors shown open)
Figure 1-10. Removable Media Drive Bays
On the upper right side of the system, below the LCD panel, are two built-in
3 1/2-inch bays. One contains a 3 1/2-inch diskette drive that supports both 720
KB and 1.44 MB media (see Figure 1-10).
Note: The SCSI termination resistors must be installed in
the last SCSI drive of the daisy chain cabling (bottom media
bay). All other devices must have terminators removed.