Adding An Expansion Unit; Prerequisites; Restrictions; Specifications - Hitachi AMS 2100 Hardware Manual

Adding an expansion unit

Prerequisites

Before starting the addition, ensure that the following requirements are
met. If not, an abnormal termination of the addition or a system down may
be caused.
• Ensure that the expansion unit being added has two power supplies and
two ENC units installed.
• Ensure that no alarm or warning LEDs are on or blinking anywhere in
the array. You can add an expansion unit only when the Warning and
Alarm LEDs on the array are off and the Power LED (green) and Ready
LED (green) light up.
• Do not perform the recognition (*1) operation of the expansion unit
during the execution of the format command (it is not the LU format
from Navigator 2 from the host computer. When the format was
executed from the host computer, add the expansion unit after the
format is completed.
• Do not add any components while the Ready LED on the front of the
base unit is blinking at high speed. When it is blinking at high-speed,
the ENC firmware is being downloaded. Add components only after
ensuring that the READY LED on the front of the base unit is ON. This
can take from 30 to 50 minutes.
• Do not add any components to a unit while the Warning LED on the
front of the base unit is blinking at high speed. The Warning LED blinks
at high speed while the firmware is being updated. Ensure that the
Warning LED on the front of the base unit is OFF and the Ready LED is
ON. This can take a maximum of 30 to 85 minutes.

Restrictions

Observe the following restrictions strictly. The system and/or the expansion
unit may shut down if these restriction are not followed.
• Do not replace any parts in the storage system while the expansion
unit. is being connected to the AMS 2100/2300.
• Do not replace any parts in the storage system while the control unit in
the AMS 2100/2300 is recognizing the expansion unit.

Specifications

• Connect at least one ENC cable per ENC Unit to the AMS 2100/2300 or
to another expansion unit.
• The number of expansion units must not exceed the maximum number
of expansion units allowed for the model of the base unit. The
expansion unit of:
• An AMS 2100 can have a maximum of seven expansion units.
• An AMS 2300 can have a maximum of 15 expansion units.
• If a failure occurs in the newly added expansion unit on the AMS 2100/
2300 during the connection and recognition process, troubleshoot and
repair the base unit first, and then repair the expansion unit.
Upgrading the hardware
Hitachi AMS 2100/2300 Storage System Hardware Guide
9–9