Attention
Never remove the interconnect-battery unit unless directed to do so by an IBM
support representative. Removing the interconnect-battery unit after a
controller or a power supply and fan unit has already been removed results in
a loss of data access. Refer to “Replacing the interconnect-battery unit” on
page 156 for complete information about the conditions required for safe
removal of the interconnect-battery unit. Do not replace the
interconnect-battery unit without first meeting the requirements described in
“Replacing the interconnect-battery unit” on page 156.
Information about the condition of the interconnect-battery unit is conveyed by
indicator LEDs on the front of interconnect-battery unit. (“Interconnect-battery unit
LEDs” on page 127 identifies the indicator LEDs on the interconnect-battery unit
and explains the conditions that each LED indicates.)
You must remove the front bezel in order to see all of the interconnect-battery unit
LEDs. With the bezel in place, only the following interconnect-battery unit LEDs are
visible:
v Power
v Overall DS4800 Configuration Needs Attention
v Locate/Identify
Note:
The displayed order of the Overall DS4800 Configuration Needs Attention
and Locate/Identify LEDs on the interconnect-battery unit are reversed when
the bezel is removed. See “Front bezel LEDs” on page 118 and
“Interconnect-battery unit LEDs” on page 127.
SFP modules
The storage subsystem supports fiber-optic interface cables. A small form-factor
pluggable (SFP) module must be installed in each interface connector on the
controller where a fiber-optic cable is to be installed.
Figure 8 shows an SFP module with fiber-optic cable. Note that the SFP module
shown might look different from those shipped with your unit. The differences do not
affect module performance.
Attention: Currently, the DS4800 supports only short-wave/multimode SFPs. In
DS4800 configurations, you may use long-wave SFPs only in fibre channel switches
that connect DS4800s over long distances. In addition, there are not any visual
markings to identify the maximum operating speeds of the SPFs aside from the
option and FRU part number on the SFP label.
SFP Module
Fibre-optic cable
ds48018
Figure 8. SFP module with fiber-optic cable
20 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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