IBM DS4800 User, Installation And Maintenance Manual page 187

Table 24. DS4800 Symptom-to-FRU index (continued)
Problem
indicator Component
Only one Blue Interconnect-
Service Action battery unit
Allowed LED is
lit with no other
amber Needs
Attention LEDs lit
Only one Blue Power
Service Action supply-fan,
Allowed LED is controller, or
lit and the amber interconnect-
Needs Attention battery unit
LED for the
same component
is lit
Unable to access Expansion drive
drives channel
Possible cause
A command from the
DS4800 Subsystem
Management window placed
the interconnect-battery unit
in Identify/Locate mode.
The component indicated by
both the blue (Service Action
Allowed) LED and the
amber (Needs Attention)
LED has failed and can be
replaced.
Fibre-channel cabling has
failed.
RAID controller has failed.
An SFP module has failed.
You have connected more
than eight expansion
enclosures to the ports of
the drive channel. Even
though the drive channel is
dual-ported, the DS4800
currently does not support
more than 112 drives per
drive channel.
Possible solutions
Stop the Identify/Locate action in the DS4800
Subsystem Management window.
Ensure that the fibre-channel cables are
undamaged and properly connected.
Replace the RAID controller.
Ensure the SFP module is seated properly;
replace the SFP module.
Power down the DS4800 and its storage
expansion enclosures. Recable the expansion
enclosures with a maximum of eight expansion
enclosures per drive channel.
Chapter 6. Hardware maintenance
165