Sun Blade 2500 memory
#1
Sun Blade 2500 memory
Hi,

anybody who can confirm that the red Sun Blade 1500/2500 is compatible with the 2GB memory modules that are listed on the data sheet
of the silver Sun Blade 1500/2500 ? The data sheet for the red Sun Blade only mentions 1GB modules.
HAL
Tezro / Onyx350

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07-01-2018, 09:34 PM
#2
Re: Sun Blade 2500 memory
HAL post_id=1297 time=1530480847 user_id=86 Wrote:anybody who can confirm that the red Sun Blade 1500/2500 is compatible with the 2GB memory modules [...]
Sorry, not really, as I don't have such a machine for testing. But I have some servers (V210 and V240) which are "similar" hardware-wise and 2 GB memory modules that work in a V245 that I could test in these - maybe later this week. I'll report the results.

As the UltraSPARC IIIi processors have the memory conroller on-die, I assume chipset differences (e.g. between V210/V240 and Blade 1500/2500 and V245) do not have an effect on the amount of memory that can be used. And according to this UltraSPARC IIIi datasheet (from 2003) each US IIIi can address 16 GB per CPU. Because of this one could assume that a V210 or V240 can make use of 32 GB of memory, but their datasheets only mention a maximum of 16 GB for the whole system. But maybe this is a limitation due to the size of DDR memory modules available at the time of publication. The V210/V240 have 8 memory sockets, so 16 GB are made out of 8 x 2 GB modules. The V440 has a total of 16 memory sockets and supports 32 GB according to its data sheet, which would be made out of 16 x 2 GB modules.

Why the red Blade 2500s should be limited to only 8 GB, although they also have 8 memory sockets like the V210/V240 and also became available end of 2003, is the question...

...oh, just found a Just-the-facts publication about the red Blade 1500/2500 that mentions on page 6 that the red Blade 1500 which has only 4 memory sockets will support up to 8 GB when 2 GB DDR memory modules become available. Nothing similar is mentioned for the Blade 2500 though, but why should it be different there? Or wait, on page 21 it is mentioned that support for 2 GB modules (for the Blade 1500) is scheduled for a later product update, which could refer to the silver Blade 1500. :-(

I'd give it a try anyhow, if the memory modules aren't too expensive.

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johnnym
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07-02-2018, 11:14 AM
#3
Re: Sun Blade 2500 memory
johnnym post_id=1307 time=1530530056 user_id=209 Wrote:
HAL post_id=1297 time=1530480847 user_id=86 Wrote:anybody who can confirm that the red Sun Blade 1500/2500 is compatible with the 2GB memory modules [...]
Sorry, not really, as I don't have such a machine for testing. But I have some servers (V210 and V240) which are "similar" hardware-wise and 2 GB memory modules that work in a V245 that I could test in these - maybe later this week. I'll report the results.
Ok, just tested the mentioned 2 GB modules in my V240 but unfortunately they weren't accepted: :-(

Code:
<i>
</i>0>Interrupt Crosscall....Done
0>Init Memory....Done
0>PLL Reset....Done
0>Init Memory....Done
0>Test Memory....Done
0>Test CPU Caches....Done
0>Functional CPU Tests....Done
0>IO-Bridge Tests....Done
0>INFO:
0>      POST Passed all devices.
0>
0>POST: Return to OBP.

SC Alert: Host System has Reset

Configuring system memory & CPU(s)

ERROR: CPU0 DIMM 0 SPD reports DIMM has unsupported CAS latency value
System configuration failed, powering off

SC Alert: Host system has shut down.

The originally installed 1 GB modules are DDR333/PC2700 (PC2100 would be sufficient for the V240) with a CAS latency of 2.5 (Sun P/N 371-1117-01). The 2 GB modules are DDR400/PC3200 and most likely have a CAS latency of 3 (IBM P/N 38L5912).

So looks like a CAS latency of 2.5 (or smaller) is a must for systems that use PC2100 memory modules. The V245 can use PC2700 modules according to its data sheet and maybe relaxed that requirement to a CAS latency of 3.

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johnnym
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07-03-2018, 09:10 PM


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