[rescue] E3000 RAM install rules?

[Steve Hatle]

Thanks gents - that info makes my life easier!

I was flashing back to when we were configuring an E4K at work and going 
through the gymnastics of interleaving.

Steve

> Ethan Hawke via rescue <mailto:rescue at sunhelp.org>
> December 11, 2025 at 8:29 PM
>
>
> That's correct, each bank on a CPU board must be the same, but there 
> is no other requirement. You can also run a CPU board with no RAM at all.
>
> You only need to match banks to enable memory interleaving for 
> enhanced performance. However enabling memory interleaving disables 
> the ability to DR (remove) a CPU board while Solaris is running.
>
> Ethan
>
>
> _______________________________________________
> rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
> Patrick Finnegan <mailto:pat at vax11.net>
> December 11, 2025 at 7:51 PM
> You don't need to match memory (or cpus) on different boards. They do 
> have to match in the same bank but I think that's all.
>
> Patrick Finnegan
>
> On Thu, Dec 11, 2025, 19:41 Steve Hatle via rescue <rescue at sunhelp.org 
> <mailto:rescue at sunhelp.org>> wrote:
> Steve Hatle <mailto:steve.hatle at gmail.com>
> December 11, 2025 at 7:40 PM
> It's been a while and I'm trying to remember the rules for RAM in the 
> E3000 with multiple CPU boards.
>
> I have three CPU boards but the RAM I have on hand (some 32MB and some 
> 128MB SIMMs) aren't enough to fill bank 0 across all three boards.
>
> I could fill bank 0 across two boards, and fill bank 1 across two 
> boards, but can I run the third CPU board with no RAM in it, or does 
> at least bank 1 have to have RAM? I assume that bank 0 on the third 
> board would have to be the same size as what's in bank 1 of board 1 
> and 2.
>
> To put it another way, I have 16 128M sticks, so I can fill bank 0 of 
> boards 1 and 2, and I have 16 32MB sticks, so I can do the second bank 
> of boards 1 and 2, but I don't have enough of either to also fill bank 
> 0 of board 3. Can board 3 function without RAM in it, or do I have to 
> fill at least all of bank 0 across all three boards?
>
> I've been looking through various Sun doc and I can't (yet) find a 
> definite answer. My gut tells me I have to cross all three boards with 
> at least bank 0.
>
> Anyone have some cheap SIMMs? Or maybe I should just be happy with two 
> boards and not try to pimp up a machine that is more a labor of love 
> than anything else :-)
>
> Thanks,
>
> Steve

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