Replacing A Backup Battery; Tools Needed; Before You Begin; Unpacking A New Backup Battery - Hitachi AMS 2000 Series Service Manual

10. Verify that both the red Alarm LED and the orange Warning LED on the
front of the base unit and the Locate LED on the front of are OFF. The
green Ready LED on the front of the unit might blink rapidly for 30 to 50
seconds before it turns ON.

Replacing a backup battery

This procedure describes how to replace a cache backup battery when the
power is on. By default, only one backup battery (#0) is installed in a base
unit. The same backup batter is used in all models of the AMS 2000 family.

Tools needed

• Anti-static wrist strap
• Navigator 2

Before you begin

Before replacing a backup battery, read the following information.
•
CAUTION! The backup battery in the base unit must be removed
and replaced with the power turned on. When the power is turned
off during replacement, user data on the cache that has not been
written on a disk is not backed up because the power is not
supplied from the battery.
When hot-swapping a part, do not leave any slot in the array open
for more than ten minutes. Otherwise, the loss of cooling air could
cause the unit to overheat and shut down.
A closed nickel-hydrogen battery can cause an electric shock or
explosion if it is handled incorrectly. Observe the following
requirements when handling the battery:
• Do not connect the battery to anything other than a base unit
for charging or use.
• Do not leave the battery in a hot place. Store the battery in a
dark cool place.
• When replacing both cache backup batteries on the AMS 2100/
2300, the cache changes to the Write-Through mode and the
R/W performance is deteriorated. Also, if the cache backup
batteries are removed from the base unit, the array changes to
the Warning status. However, when the cache backup batteries
are recovered normally, the array Warning status displays.

Unpacking a new backup battery

1. Remove the cache backup battery unit from the container.
2. Verify that you have the correct model number. See
Replaceable

Verifying that the backup battery has failed

Verify that the cache backup battery unit has failed. See
Identifying failed parts
parts.
.
Replacing parts
Hitachi AMS 2000 Family Storage System Service Guide
Chapter 3,
Chapter 2,
4–23