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Mini hub LEDs
There are five LEDs on each mini hub. Figure 93 shows the host-side LEDs. The
drive-side LEDs are the same; however, the possible conditions indicated by the
problem status (described in Table 23) might be different.
Table 23 describes the LED status when there are Fibre Channel connections to
devices between host-side and drive-side mini hubs.
Table 23. Host-side and drive-side mini hub LEDs
Icon LED Color
Normal
status
Problem
status
Possible condition indicated by the
problem status
None Speed Green On for 2 GB
Off for 1 GB
N/A Lit LED indicates data transfer rate of 2
Gbps. LED off indicates data transfer rate
of 1 Gbps.
! Fault Amber Off On Mini hub has failed.
Note: If a host-side mini hub is not
connected to a controller, this fault LED
is always lit.
Bypass (upper
port)
Amber Off On
v Upper mini hub port is bypassed.
v Mini hub port or SFP module has
failed or is loose.
v Fiber-optic cables are damaged.
Note:
When two functioning SFP
modules are installed into the mini-hub
ports and no Fibre Channel cables are
connected to them, the bypass LED is lit.
If only one functioning SFP module is
installed in a host-side mini hub port and
no Fibre Channel cables are connected
to it, the LED will not be lit.
However, the drive-side mini hub bypass
LED will be lit when one SFP module is
installed in the mini hub and the mini hub
has no Fibre Channel cable connection.
Figure 93. Mini hub LEDs
134 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide