Sun Enterprise 4500 Server
 
Sun Enterprise 5500 Server
 
Sun Enterprise 3500 Server
 
Sun Enterprise 6500 Server
 

GCS>Sun Microsystems>Servers>Midrange Servers
 

Applies to:

Symptoms

Changes

Cause

Solution

Ultra Enterprise servers (UEXX00) have the ability to use memory interleaving. Memory interleaving can be viewed by the prtdiag command.

First you need to understand that you have possibility of 1-Way, 2-Way, 4-Way and 8-Way interleaving. In order to have any of the above memory interleaving groups, your memory boards must be the same size in each bank. Memory interleaving will group same size memory banks together.

Your memory banks should be installed by installing them in bank 0 on all systems boards. Once ALL memory boards' bank0 are full then you should fill bank1 starting on memory board 0. Larger banks must be installed 1st for best performance.

========================= Memory =========================

                                              Intrlv.  Intrlv.
Brd   Bank   MB    Status   Condition  Speed   Factor   With
---  -----  ----  -------  ----------  -----  -------  -------
 0     0    1024   Active      OK       60ns    8-way     A
 0     1    1024   Active      OK       60ns    8-way     A
 2     0    1024   Active      OK       60ns    8-way     A
 2     1    1024   Active      OK       60ns    8-way     A
 4     0    1024   Active      OK       60ns    8-way     A
 4     1    1024   Active      OK       60ns    4-way     B
 5     0    1024   Active      OK       60ns    8-way     A
 5     1    1024   Active      OK       60ns    4-way     B
 6     0    1024   Active      OK       60ns    8-way     A
 6     1    1024   Active      OK       60ns    4-way     B
 7     0    1024   Active      OK       60ns    8-way     A
 7     1    1024   Active      OK       60ns    4-way     B

In the above example you have 12 banks all 1024MB in size. Since you have maximum possible 8-Way this will leave 4 more banks to have addition 4-Way. Thus group A = 8-Way and Group B = 4-Way.

Memory Board#	Memory Bank0	Memory Bank1
=============================================

0		    A		    A
2		    A		    A
4		    A		    B
5		    A		    B
6		    A		    B
7		    A		    B
***************************************************************

************************* EXAMPLE #2 ***************************
========================= Memory =========================

                                              Intrlv.  Intrlv.
Brd   Bank   MB    Status   Condition  Speed   Factor   With
---  -----  ----  -------  ----------  -----  -------  -------
 0     0     256   Active      OK       60ns    4-way     A
 0     1     256   Active      OK       60ns    4-way     A
 2     0     256   Active      OK       60ns    4-way     A
 2     1     256   Active      OK       60ns    1-way     B
 4     0     256   Active      OK       60ns    4-way     A

In this example you have 5 banks all the same size. So you will have 4-Way and 1-Way. The 1st group of 4-Way will be grouped using Bank 0 on all system boards. Then it will add bank1 from memory board 0 to complete a 4-Way. Leaving only 1 bank left will make a 1-Way on bank1 of board#2. Below you see how the system groups them.

Memory Board#	Memory Bank0	Memory Bank1
=============================================

0		    A		    A
2		    A		    B
4		    A		     
***************************************************************



************************* EXAMPLE #3 ***************************
========================= Memory =========================

                                              Intrlv.  Intrlv.
Brd   Bank   MB    Status   Condition  Speed   Factor   With
---  -----  ----  -------  ----------  -----  -------  -------
 0     0    1024   Active      OK       60ns    4-way     A
 0     1     256   Active      OK       60ns    4-way     B
 2     0    1024   Active      OK       60ns    4-way     A
 2     1     256   Active      OK       60ns    4-way     B
 4     0    1024   Active      OK       60ns    4-way     A
 4     1     256   Active      OK       60ns    4-way     B
 6     0    1024   Active      OK       60ns    4-way     A
 6     1     256   Active      OK       60ns    4-way     B

In this example you have 8 banks. But it will not group them in a single 8-Way bank because of the 2 difference sizes of banks. So the 4 banks of 1024MB will be a 4-way. Then the 4 banks of 256MB will be a 2nd 4-way. Below you can see how it groups them.

Memory Board#	Memory Bank0	Memory Bank1
=============================================

0		    A		    B
2		    A		    B
4		    A		    B
6		    A		    B
***************************************************************

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