IBM System Storage Subsystem DS5020 - Manual (Page 184)

Table 20. Symptom-to-FRU index
Problem
indicator
Component Possible cause Possible solutions
Amber LED is lit Drive CRU
(Drive Fault
LED)
Note: The
green Drive
Activity LED
might also be
lit. Drive failure Replace the failed drive.
Note: The amber LED on the
drive is also lit if the drive slot
has a blank drive tray inserted.
Drive uncertified Verify the drive option and FRU
part number to verify that it is
supported by the DS5020 storage
subsystem. (For FRU part
numbers, see Table 21 on page
161.)
RAID controller
(Fault LED)
Note:
Controller
Service Action
Allowed LED
will also be lit. RAID controller
failure Replace the RAID controller. See
your controller documentation for
more information. See Chapter 5,
“Replacing components,” on page
121 for more information.
Controller was
placed offline by a
user or the other
controller. Use the menu function in the
DS5020 Subsystem Management
window to place the controller
back online. If the controller
continues going to an offline state
after being placed online, replace
the RAID controller.
Unsupported
controller type. For
example, a DS4200
Express FRU is
inserted into a
DS5020 chassis. Use the Storage Manager Client
Subsystem Management window
and Recovery Guru to verify that
the correct controller FRU is
used. Replace with the correct
DS5020 controller FRU.
RAID controller
(Port Bypass
LED) No incoming signal
detected Reconnect the SFP modules and
the Fibre Channel cables. Verify
the input and output SFP using
the path failure determination
instruction in the DS4000
Problem Determination Guide
and the Fibre Channel loopback
and female-female LC connector.
Replace either input or output
SFP modules or Fibre Channel
cables as necessary.
Incorrect enclosure
speed setting When connecting storage
expansion enclosures to the
existing operating redundant
drive loop with a different speed
setting, the port goes into bypass
mode because mixing different
speed enclosures within the
same redundant drive
loop/channel is not supported.
RAID controller
failure If the RAID controller Fault LED
is lit, also replace the RAID
controller.
154 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide