IBM TotalStorage DS4000 Hardware Maintenance Manual page 128

Table 47. DS4500 storage server host-side and drive-side mini hub indicator lights (continued)
Icon Indicator light
Bypass
(upper port)
Loop good
100
IBM TotalStorage DS4000: Hardware Maintenance Manual
Normal
Color operation
Amber Off
Green On
Problem Possible condition indicated by
indicator the problem indicator
On
v Upper mini hub port is
bypassed.
v Mini hub or SFP module
failed, is loose, or is missing.
v Fiber-optic cables are damaged.
Note: When two functioning SFP
modules are installed into the
mini hub ports and no fibre
channel are cables connected to
them, the bypass indicator is lit.
If there is only one functioning
SFP module installed in a
host-side mini hub port and there
are no fibre channel cables
connected to it, the indicator light
will not be lit.
However, the drive-side mini hub
bypass indicator light will be lit
when one SFP module is installed
in the mini hub and the mini hub
has no fibre channel connection.
Off
v The loop is not operational, no
devices are connected.
v Mini hub failed or a faulty
device is connected to the mini
hub.
v If there is no SFP module
installed, the indicator will be
lit.
v If one functioning SFP module
is installed in the host-side
mini hub port and no fibre
channel cable is connected to
it, the loop good indicator light
will not be lit.
If one functioning SFP module
is installed in the drive-side
mini hub port and no fibre
channel cable is connected to
it, the loop good indicator light
will be lit.
v Drive enclosure failed
(drive-side mini hub only).