Rear Panel; Cache Backup Batteries - Hitachi AMS 2100 Hardware Manual

Table 4-3: Base Unit Status LEDs (front panel) (Continued)
Item
ALarM

LED
(red)
ACTive
LED

(green)
Alarm

LED
(red)
Ready
LED
(green)

indicates
battery
condition

Rear panel

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

Cache backup batteries

The AMS 2100 and AMS 2300 base units include two cache backup
batteries. See items #3 and #4 in
batteries can preserve the data in the cache for 24 to 72 hours, depending
on the size of the cache and the amount of data in it. See
management
Figure 4-4
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.
Name/
Status
Color
Disk Drive Status LEDs (see
ON
OFF
ON or
Flashing
OFF
Cache Backup Battery (see
ON
OFF
ON
Slow Blink
Off or
Fast Blink
units.
in Chapter 1 for details.
shows the cache backup battery. The front panel on the battery
Hardware components
Hitachi AMS 2100/2300 Storage System Hardware Guide
Description
Disk drive status LEDs on page 4-3
Lights when the drive has a serious Error.
Normal Status
Lights or flashes when the drive is operating and is
being read from or written to. It indicates that the
disk drive is operational.
No data is being transferred
Cache backup batteries on page 4-5
Indicates that the battery has failed.
Indicates that the battery status is normal.
Normal status
(1 blink per second): The battery is not fully
charged.
(8 blinks per second): Abnormal status
Base unit power supplies
Figure 4-1 on page
).
)
and the
4-2. Two fully charged
Cache
4–5