Locate a Faulty DIMM

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You must determine which DIMM is faulty before you replace it.

Check to see if any System Service Required LEDs are lit or flashing.
See Interpreting Diagnostic LEDs.

In Oracle ILOM, check the health of the memory system.
```
-> show /System/Memory 
 /System/Memory
 	Targets:
 	Properties:
 		health = OK
 		health_details = -
...
->
```
If the health_details property identifies a faulty DIMM, replace it. See Remove a DIMM.

Verify a DIMM is recognized.
```
-> show /System/Memory/DIMMs
 /System/Memory/DIMMs
 	Targets:
 		DIMM_x
 		DIMM_y
...
->
```
where x, y, and so on, are the slot numbers where DIMMs are installed.

If a DIMM is not recognized, check its installation. See Remove a DIMM.

Check the health of the individual DIMMs and verify their identity.
```
-> show /System/Memory/DIMMs/DIMM_x 
 /System/Memory/DIMMs/DIMM_7
 	Targets:
 	Properties:
 		health = OK
 		health_details = -
...
->
```
where x is the number of the DIMM, from 0 to 23.

If the health_details property identifies the DIMM as faulty, or the DIMM cannot be identified, replace it. See Remove a DIMM.

Verify that a DIMM is faulty.
If a DIMM is faulty, you will see /SYS/MB/Px/Dy under the Value heading where:
- x is 0 or 1.
- y is 0 to 11.
For example:
```
-> show faulty
Target              | Property               | Value
--------------------+------------------------+-------------------------------
/SP/faultmgmt/0     | fru                    | /SYS/MB/P0/D7
...
->
```
If a DIMM is faulty, replace it. See Remove a DIMM.

If a FRU value different from /SYS/MB/Px/Dy is displayed, see Component Service Task Reference to identify which component is faulty.

Use the Oracle ILOM faultmgmt shell to identify the faulty component.
See Display Faults (faultmgmt Shell).

Check the Fault class and Description fields for more information.

If a DIMM is faulty, replace it. See Remove a DIMM.

If you are unable to determine if a DIMM is faulty, seek further information.
See Detecting and Managing Faults.