Hitachi AMS 2100, Service Manual

Page: 63 / 192

Introduction
1–23
Hitachi AMS 2000 Family Storage System Service Guide
Cache backup battery LEDs
The AMS 2100/2300/2500 base unit includes two cache backup batteries
standard. The AMS 2500 includes two additional slots for optional cache
backup batteries. Refer to Figure 1-6 on page 1-9 . Two fully charged
batteries can preserve the data in the cache for 30 to 48 hours, depending
on the amount of data in the cache.
Figure 1-21 shows the cache backup battery. The front panel on the battery
contains an Alarm LED and a Ready LED. The battery includes a lock lever
that keeps the battery securely installed in the array and is used to remove
the battery when needed.
Figure 1-21: Cache Backup Battery
Rear panel LEDs and connectors - AMS 2100/2300
The rear panel of the AMS 2100/2300 base unit has several LEDs that
indicate the status of the power supplies and control units. These LEDs are
explained as part of the descriptions of the Control unit LEDs, connectors,
and switches - AMS 2100/2300 on page 1-24 , and the Base unit power
supply status LEDs on page 1-30 .
Table 1-12: Cache Backup Battery
Item Description Status
1
Lock Lever
When the lock lever is closed and the blue button is fully
extended, the battery is secured to the array.
2
Alarm LED
RED
• When on, indicates that the battery has failed.
• When off, indicates that the battery status is normal.
3
Ready LED
GREEN
This LED indicates the condition of the battery.
•
On: normal status
• Low-speed blinking (1 blink per second): The battery is
not fully charged.
•
Off or high-speed blinking (8 blinks per second):
Abnormal status