Sun Microsystems SPARCcenter 2000 Service Manual page 312

Disk Drive Tray
DSBE/S
Filler panel
J-number
Key Switch
Media Tray
NVSIMM
Reset Switch
Root Disk
SBus Card
SCSI Tray
Glossary-2
A disk drive tray can hold up to six SCSI disk drives. This option is used in the
SPARCcenter 2000 system cabinet, the disk expansion cabinet, and the tape
expansion cabinet.
The Differential SCSI/Buffered Ethernet (DSBE/S) card is a dual-function SBus
card. It controls peripheral drives and twisted-pair (10Base-T) Ethernet.
See Air Restrictor Panel
A J-number is the location of a device socket. In this manual, a J-number
corresponds to a U-number, which identifies a replaceable memory module.
The key switch on the hinged door controls the DC supplies and the modes of
system operation.
A shelf is provided on the back of the system door. This shelf can hold tape
cartridges and SunCDs to be used in the adjacent SCSI tray drives.
The nonvolatile SIMM (NVSIMM) is a battery-backed SIMM. Battery current is
shared in a group of NVSIMMs, in the event that a single battery fails.
This switch is located on the back of the hinged door.
The root disk is the disk drive where the operating system resides.
SBus cards provide external interfaces and optional features to the system.
There are four SBus connectors on a SPARCcenter 2000 system board.
The SCSI drive tray is located in the upper part of the main server cabinet,
behind the hinged door. This tray holds one SunCD drive, and up to five tape
drives.
SPARCcenter 2000/2000E Service Manual—June 1996