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EonStor A08U/A12U-G2421 Installation and Hardware Reference Manual
• COM Port
All controller modules come with one RS-232C (audio jack) serial port. The serial
port is used for local access to the system-embedded configuration utility over the
included serial port cable.
DIMM Module
The controller module comes with a preinstalled 256MB capacity or above DDR
RAM DIMM module and can support a larger capacity up to 2GB. The DIMM
module is mounted in an easily accessible location on the controller board. However,
when the DIMM module is being changed, the controller module must be removed
from the subsystem chassis.
1.2.4 Battery Backup Unit
PN: IFT-9273CBT-C
An optional, separately purchased Li-ION battery backup unit (BBU) module can
sustain cache memory for days after a power failure. If you purchased a BBU, it will
be installed on the upper left corner of the controller module in the rear of subsystem
chassis. Please refer to Chapter 2 for installation details.
Figure 1-16: BBU Module
In accordance with international transportation regulations, the BBU module is only
charged to between 35% and 45% of its total capacity when shipped. Therefore,
when powering on the subsystem for the first time (see Section 4.4) the BBU will
begin to charge its batteries to their full capacity. It normally requires approximately
twelve (12) hours for the battery to be fully charged. If the battery is not fully
charged after twelve (12) hours (its LED is still flashing), there is a problem with the
BBU module and you should contact your subsystem vendor immediately. While the
battery is being charged, the LED on the BBU rear panel and the fifth LED on the
controller module will flash. (See Chapter 3.2.6 for details on the LED indicators.)
You can check the status of the battery’s charge via RAIDWatch manager or the
firmware utility screen.
Subsystem Components
1-10