Hitachi AMS 2100, Hardware Manual

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Hardware components
4–25
Hitachi AMS 2100/2300 Storage System Hardware Guide
Standard expansion unit
A standard expansion storage unit (RKAK) provides additional storage
capabilities for the base units. An expansion unit can hold from 2 to 15 SATA
or SAS drives. SATA and SAS drives can be mixed within the same
enclosure, so long as the guidelines under Disk drive configurations on page
4-3 and RAID implementations on page 1-22 are followed.
Both the AMS 2100 and the AMS 2300 base units use the same expansion
unit, although the number of expansion units that they can use is different.
• An AMS 2100 base unit supports up to seven expansion units.
• An AMS 2300 base unit supports up to fifteen expansion units.
Drives are installed, removed, and replaced from the front of the expansion
unit. No tools are required.
Expansion unit (RKAK) front panel
The following illustration shows the front of an expansion unit (factory
designation RKAK) with the decorative bezel installed.
The front panel of the expansion unit includes Power and Locate status LEDs
that show the status of the unit and identify the unit. The installation
location should provide an unobstructed view of these LEDs.
In addition, each drive slot on the expansion unit has alarm and Active LEDs
that show the status of the drive that is installed in the slot that is directly
below the status LEDS. As shown in Figure 4-18 on page 4-26 , these LEDs
are visible when the front bezel is removed. A close up photo of the drive
status LEDs is shown in Figure 4-2 on page 4-3 .
There are no switches on an expansion unit. Power is turned on and off with
a control signal that is routed from the base unit via the ENC cables that are
connected to the ENC unit in the expansion unit.
Figure 4-17: Front View of an Expansion Unit
Table 4-17: Expansion Unit Front View
Item Description Item Description

Locate LED - Indicates that a
failure which does not stop
operation occurred in unit.
(orange)

Power LED
(green)