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Drive Module Site Preparation Guide 3
Table 1 Unique Terminology and Concepts
Term Definition Usage Examples
canister
Portable, removable container for components. Also
known as CRU.
controller canister
command
module
Compact unit that contains one or two controllers,
power supplies, and fans. Note: The E2400 command
module also contains disk drives. Also known as
controller module or controller tray.
command module
drive module
Compact unit that contains disk drives, power supplies,
one or two ESMs, and fans. Also known as drive tray or
expansion drive module.
drive module
ESM
Environmental Services Monitor. Interface board that
provides interface connections between the drive
modules and the SCSI bus, and environmental
information about the drive module to the host. Also
known as ESM CRU, ECC, or environmental card.
ESM canister
GBIC
Gigabit interface converter. A device used in Fibre
Channel networks to convert copper fibre signals to
fiber optic and vice versa.
copper GBIC minihub
copper GBIC module
optical GBIC minihub
optical GBIC module
light
Lights that glow or blink to indicate either a normal
operating status or hardware error. Also known as LEDs.
indicator light
Power light
Fault light