R900 RAM Configuration

Jens_Heinz at Dell.com Jens_Heinz at Dell.com
Thu Mar 25 03:49:25 CDT 2010


You have 4x memory risers named A, B, C, D.
Every riser is capable to hold up to 8x DIMMs (ie. A1, A2, ... A8) 
That makes a total of 32x DIMMs in your system. In other words your
system is full. 

If you swap DIMM A1 you'll have to swap B1, C1 and D1 as well. 
For optimum configuration you shouldn't mix DIMMs of different sizes. 

So one solution might be, to remove all 2GB DIMMs, fill up first 4x
slots of every with 8GB DIMMs. That'll leave you spare slot to expand
further in future. 
Or you just replace all your 2GB DIMMs with 4GB DIMMs.

Jens 

-----Original Message-----
From: Nick Lunt [mailto:nick.lunt at patech-solutions.com] 
Sent: 25 March 2010 09:37
To: Heinz, Jens
Cc: linux-poweredge-Lists
Subject: RE: R900 RAM Configuration

> -----Original Message-----
> From: Jens_Heinz at Dell.com [mailto:Jens_Heinz at Dell.com]
> Sent: 24 March 2010 15:19
> To: Nick Lunt
> Subject: RE: R900 RAM Configuration
> 
> This link might help
> 
>
http://support.dell.com/support/edocs/systems/per900/en/hom/_sectioc.ht
> m
> #wp1082885
> 
> Jens
> 
> -----Original Message-----
> From: linux-poweredge-bounces at dell.com
> [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Nick Lunt
> Sent: 24 March 2010 16:09
> To: linux-poweredge-Lists; linux-poweredge-Lists
> Subject: R900 RAM Configuration
> 
> Hi
> 
> we have an R900 with 32 x 2GB DIMMs in, so the server has no free DIMM
> slots.
> All the DIMMs are DDR2 FB-DIMM-SYNCHRONOUS .
> 
> We need to increase the RAM from 64GB to a minimum of 103GB (based on
> our calculations), so really I guess we'd be looking at increasing the
> RAM to 104GB, or just going for a nice round 128GB :)
> 
> Can anyone recommend the best upgrade method for this ?
> Do we need to keep RAM in banks all the same size ?
> How many DIMMs are in each bank ?
> 
> Basically is there anything we need to be aware of when removing some
> DIMMs and adding larger ones ?

Right, that doc says 4 risers must be installed at all times.
Seen as we have 32 DIMMs does that mean we have 8 risers ? 
I.e. A1,B1,C1,D1 is a full riser. A1,B2,C2,D2 is another riser, etc ?

Status: OK	DIMM A1 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B1 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C1 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D1 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A2 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B2 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C2 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D2 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A3 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B3 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C3 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D3 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A4 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B4 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C4 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D4 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A5 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B5 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C5 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D5 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A6 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B6 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C6 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D6 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A7 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B7 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C7 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D7 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM A8 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM B8 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM C8 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB
Status: OK	DIMM D8 	DDR2 FB-DIMM-SYNCHRONOUS	2048 MB

So if I changed A1 to a 4GB DIMM then I should change A2, A3, A4, A5,
A6, A7 and A8 to 4GB DIMMs too ?

Thanks
Nick.

 

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