Fujitsu ETERNUS DX60 S4 Design Manual page 125

3. Hardware Configurations
Configuration Schematics
Memory: System Memory
BUD: Bootup and Utility Device
• Backup area in case of power outage
Storage area for firmware
•
BBU: Battery Backup Unit
Backup power source in case of power outage
IOC: I/O Controller
Controller to control I/O
EXP: SAS Expander
Expander chip for SAS connections
DE: Drive Enclosure
IOM: I/O Module
Unit that controls I/O between controllers and drives
MP: Mid Plane
Board that is located between the front of the enclosure and the rear of the enclosure (the controller
(CM) or I/O module (IOM) side)
PSU: Power Supply Unit
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
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