IBM TotalStorage DS4000 Hardware Maintenance Manual page 116

Table 40. DS4400 storage server host-side and drive-side mini hub indicator lights (continued)
Icon Indicator light
Loop good
Bypass
(lower port)
88
IBM TotalStorage DS4000: Hardware Maintenance Manual
Normal
Color operation
Green On
Amber Off
Problem Possible condition indicated by
indicator the problem indicator
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 there is no
fibre channel cable 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 there is no
fibre channel cable connected
to it, the loop good indicator
light will be lit.
v Drive enclosure failed
(drive-side mini hub only)
On
v Lower mini hub port is
bypassed; there are no devices
connected
v Mini hub or SFP module failed
or is loose
v Fiber-optic cables are damaged
Note: When there are two
functioning SFP modules
installed into the mini hub port
and there are no fibre channel
cables connected to them, the
bypass indicator light is lit.
If there is only one functioning
SFP module installed in a
host-side mini hub and there are
no fibre channel cables connected
to it, the indicator light is not lit.
However, the drive-side mini hub
bypass indicator light will be lit
when there is one functioning
SFP module installed in the mini
hub port and the mini hub has
no fibre channel cables connected
to it.