IBM System x3950, Problem Determination And Service Manual

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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v
See Chapter 3, “Parts listing, Type 8878 and 8879,” on page 109 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Lit light path
diagnostics LED with
the system-error or
system-information
LED also lit Description Action
DASD A hard disk drive has failed or has
been removed.
Note: The error LED on the failing
hard disk drive is also lit.
1. Reinstall the removed drive.
2. Reseat the following components:
a. Failing hard disk drive
b. SAS hard disk drive backplane
c. SAS 6x cable
d. I/O board
3. Replace the components listed in step 2 one at a
time, in the order shown, restarting the server each
time.
RAID The RAID adapter (ServeRAID-8i)
has indicated a fault.
1. See the BMC log or the system-error log (see
“Error logs” on page 19).
2. Reseat the following components:
a. RAID adapter
b. Hard disk drives
c. I/O board
3. Replace the components listed in step 2 one at a
time, in the order shown, restarting the server each
time.
NONRED The server is operating with
nonredundant power. If a power
supply or its ac power source fails,
the system will be over spec.
Note: The LOG LED might also be
lit.
1. If the PS LED on the light path diagnostics panel is
lit, follow the instructions for that LED.
2. Replace the failing power supply.
3. Remove optional devices.
4. Use 220 V ac instead of 110 V ac.
TEMP A system temperature or component
has exceeded specifications.
Note: A fan LED might also be lit.
1. See the BMC log or the system-error log (see
“Error logs” on page 19) for the source of the fault.
2. Make sure that the airflow of the server is not
blocked.
3. If a fan LED is lit, reseat the fan.
4. Replace the fan for which the LED is lit.
5. Make sure that the room is neither too hot nor too
cold (see “Environment” in “Features and
specifications” on page 3).
6. If one of the VRDs indicates “hot,” ac power must
be removed before dc power can be restored.
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IBM System x3950 Type 8878 and System x3950 E Type 8879: Problem Determination and Service Guide