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Topic Title: How do I address more than 16GB of RAM
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Created On: 06/28/2006 05:55 AM
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 06/28/2006 05:55 AM
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Joined: 06/28/2006

We are building a large in memory DB in Java - however I meet lots of FUD about Opteron and the max of memory it can address.

I am told that each Opteron can onlt address !^GB but this seems silly surely its an issue with the Motherboard?

We intend to to use 64 bit Linux and if poss. Opteron dual CPU server. Ideally I want the single memeory DB to address up to 32 GB just in RAM .

can this be done and how?

many thanks

 06/28/2006 04:29 PM
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64-bit operating systems have the potential to address memory by the terabyte. 32GB ought to be child's play. Your biggest issue after installing a 64-bit OS would be drivers; doubly so with 64-bit linux drivers.
 07/03/2006 06:29 AM
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with 2xx and 8xx opterons, eg socket 940

Your max is usally 4GB times the number of dimm slots, eg most boards are 4 dimms per cpu giving 16GB per cpu, hwever that will usaly enatil the memory speeds dropping to dddr266 speeds.
I will make a dual board with 8 dimms which gives you 32 G per cpu @ ddr266 speeds.

Hwever finding reasonable priced 4Gb dimms is quite hard...actually its pretty hard to find them at all.

Your mostly likly scenario would be a dual 2xx baord with 8 dimms(4 per cpu) using 2G ddr 400 dimms giving you 32 Gig of ddr 400 goodness.

Usually and "enterprise" or "smp" linux kernels have large memory support, but sometimes your may have to compile a new kernel to use the larger sizes.

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