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A high-density expansion unit that contains two storage sections. Each
section contains two redundant power supplies, two redundant ENC control
units, and from 0 to 24 disk drives. The maximum number of drives that
can be installed in a high-density expansion unit is 48. These must all be
SATA drives.
The minimum and maximum number of expansion units for each base unit
are shown in
Table 1-3: High-density Expansion Unit (RKAKX) Configurations
Model
AMS 2100
AMS 2300
AMS 2500
1. Minimum supported HDS configuration is two disk drives installed in slots 0 and
1 in Unit A, and two drives installed in slots 0 and 1 in Unit B.
Modular 2U SAS expansion unit
Hitachi AMS 2100 and AMS 2300 storage systems support connection to a
2U SAS expansion unit. This unit contains two redundant power supplies,
two ENC interface units, and from two to 24 small form factor (SFF) disk
drives. It can connect to additional expansion units or high-density
expansion units. The same expansion unit is used with both base unit
models. The factory designation for the modular 2U SAS expansion unit is
RKAKS.
Battery expansion units
The AMS 2500 supports one or two battery expansion units. Each battery
expansion unit contains its own charger which is powered by 100/200 VAC.
A single battery can be connected to both control units. If two batteries are
installed, each battery is connected separately to a different controller. See
Battery expansion unit LEDs and controls on page 1-40
information about this unit.
System components
The front bezels on all three base unit models in the AMS 2000 Family (AMS
2100, AMS 2300, and AMS 2500) base units are identical. Light-Emitting
Diode (LED) indicators show the unit's power, ready, warning, and alarm
status. Detailed information about the status LEDs is located in
page
1-21.
1–6
Table
1-3.
Base Unit
Disk Drives
Min
Max
4
15
4
15
0
0
Introduction
Hitachi AMS 2000 Family Storage System Service Guide
Expansion Unit
Units
Min
Max
0
1
2 in each
0
4
section of the
1
10
Disk Drives
Min
Max
48 per
unit
1
unit
for detailed
Base unit on
- Quick Links:
- Disk Drives
- Replacing a Control Unit
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Troubleshooting
