Asset ID:	1-71-1018972.1
Update Date:	2011-05-26
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1018972.1 :   How To Relate Memory Error Location on SunFire V440 to Actual DIMM Locations [Video]  


PreviouslyPublishedAs
231364

Applies to:

Sun Fire V440 Server
All Platforms

Goal

How To Relate Memory Error Location on Sun Fire[TM] V440 to Actual DIMM Locations

Available for this topic, a Video Tutorial; Brief how-to video tutorials that provide step-by-step instructions answering Sun's most frequently asked questions. View the video answer and/or follow the detailed instructions below.

Video - How to Relate Memory Errors in a V440 Server (05:30)

Solution

This document discusses how to relate memory error locations on a Sun Fire V440 server to troubleshoot the server.

This information is intended only to decode what DIMM location is being referenced by the error message. Future documents will go into greater detail of the error and under what circumstances a DIMM should be replaced.

Sun Fire V440 - Layout

4 DIMMs/CPU module:

CPU0: C0/P0/{B0,B1}/{D0,D1}
CPU1: C1/P0/{B0,B1}/{D0,D1}
CPU2: C2/P0/{B0,B1}/{D0,D1}
CPU3: C3/P0/{B0,B1}/{D0,D1}

Total Max 16 DIMMs

On a Sun Fire V440 system there can be up to four CPU/MEM module. Their identity is based on what slot they are plugged into on the Motherboard. Since the J number will not be visible, it is suggested to look for the "C0" "C1" "C2" "C3" markings embossed in plastic at the top of the CPU/MEM module card cage.

Slot J0301 on Motherboard equates to CPU0 (slot closest to center of system)

Slot J0401 on Motherboard equates to CPU1

Slot J0501 on Motherboard equates to CPU2

Slot J0601 on Motherboard equates to CPU3 (slot closest to right side of system)


Each Sun Fire V440 CPU/Memory board there is four memory slots.  The first slot on the top edge of the board is slot J0702. Although difficult to see, the "J" numbers are on the back edge of the board which in this case is referred to as B1 D1.  This is DIMM one.

The J "number" for slot two is J0701 which you refer to as B1 D0.

The J "number" for slot two is J0702 which you refer to as B1 D1.

The J "number" for slot-three J0602 or B0 D1.  This is DIMM 1.  

The J "number" for slot four is J0601 which you refer to as B0 D0. Bottom slot on the board.  


Make sure all DIMMs are in pairs and that when they are replaced, they are replaced as pairs.  

Here is an example.  If you receive an error in /var/adm/messages, such as corrective memory error on C1 P0.  This error is referring to processor zero, B1 D0 and B1 D2. Notice that the message identifies both pairs of the DIMMs to be replaced.  

Example:

Corrected Memory Error on C1/P0/B1/D1: B1/D1
(Repeat of Bank 1 DIMM 1 info)

CPU1 Slot J0401 on Motherboard
P0, Processor 0 (on V440 it will always be 0, this is not a reference to the CPU#, it means that there is only one CPU in each cpu/memory board)

Bank 1 DIMM 1
Which is Slot J0702
on CPU1

Additionally on the motherboard, the slot J0301 indicates that this is CPU 0. CPU 0 has to be a working CPU and it must have two working memory DIMMs for the system to boot.





Product
Sun Fire V440 Server


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