Hitachi AMS 2100, Hardware Manual

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4–42
Hardware components
Hitachi AMS 2100/2300 Storage System Hardware Guide
High-density expansion unit top view
Figure 4-35 shows the top view of high-density expansion unit with the
drive cover removed. The disk drives and ENC cards can be seen, along with
the drive fillers where disk drives are not installed. These are required to
prevent loss of cooling air to the drives.
Figure 4-35: High-density Expansion Unit Top View
Table 4-34: ENC Connectors
Item Description Item Description

ENC Port (IN). Connects to the
OUT port on either the base unit
controller the IN port on the
ENC unit in an expansion unit or
high-density expansion unit.

ALM (alarm) LED (red) This LED
indicates that the ENC unit has
failed.

Lock Lever

LOC (locate) LED (orange)
See Table 4-25 on page 4-32 .

ENC Port (OUT). Connects to IN on either the controller on a base unit or the
IN port on the ENC unit in an expansion unit or high-density expansion unit.
Table 4-35: High-density Expansion Unit Top View
Item Description Item Description

Power Supply Area

Disk Drive Filler (must be in all slots
that do not have disk drives
installed.)

ENC Unit (four required)

Disk Drive. See Disk Drive
Configurations following this table.