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Table 45. Host and drive channel LED definitions
L1 L2 Definition
Off Off When both LEDs for a host or drive channel are off, this indicates one or more
of the following conditions:
v The host or drive channel ports are bad or the SFPs are faulty.
v An SFP module is inserted with no fibre channel cable attached.
Note: If the SFP is inserted in a drive port with no fibre channel attached,
the associated drive port bypassed LED will also be lit. In addition, the L1
and L2 LEDs will be unlit.
v No SFP module is inserted in one or both of the host or drive ports in the
channel.
On Off The host or drive channel l is operating at 1 Gbps.
Note: This pattern is not applicable in the drive port because the DS4700
Express does not support 1 Gbps fibre channel speed.
Off On The host or drive channel is operating at 2 Gbps.
On On The host or drive channel is operating at 4 Gbps.
Seven-segment numeric display LEDs
The numeric display consists of two seven-segment LEDs that provide information
about enclosure identification and diagnostics. Figure 102 shows the numeric
display and the diagnostic LED.
When you power on the storage subsystem, the seven-segment LEDs show 88
before the boot firmware starts to run. After the boot code starts,--isdisplayed.
When the storage subsystem is operating normally, the numeric display shows the
enclosure identification (enclosure ID) of the storage subsystem.
If an error has occurred and the Needs Attention LED is on, the numeric display
shows diagnostic information. The numeric display indicates the information is
diagnostic by illuminating an LED that appears as a decimal point between the
76041
Diagnostic LED
Seven-
segment
display
ds48042
Figure 102. Numeric display LEDs
132 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide