RAID1 rebuild time question

"Brian Inglis" wrote in message
...

May not be a faulty DIMM, the fault may be installing 3 DIMMs: most
systems nowadays will only run with 2 normal spec DIMMs, unless all
DIMMs are registered or tested:

You have the answer!
I had 2 "paired" DIMMs and one "rogue" with slightly different timings.
I could never find anything really *wrong* with that "odd" one, but when I
leave that one out, the system works like a charm.

Frank de Groot:

"Brian Inglis" wrote in message
...

May not be a faulty DIMM, the fault may be installing 3 DIMMs: most
systems nowadays will only run with 2 normal spec DIMMs, unless all
DIMMs are registered or tested:

You have the answer!
I had 2 "paired" DIMMs and one "rogue" with slightly different timings.
I could never find anything really *wrong* with that "odd" one, but when I
leave that one out, the system works like a charm.

If you want to make sure that your memory is OK now, go to
http://www.memtest.org/ or to http://www.memtest86.com/ and use the
memory testing tools there for further verification. They catch a lot
of hardware problems.

--

Joerg Lenneis

email:

Frank de Groot wrote:
"Brian Inglis" wrote in message
.. .

May not be a faulty DIMM, the fault may be installing 3 DIMMs: most
systems nowadays will only run with 2 normal spec DIMMs, unless all
DIMMs are registered or tested:

You have the answer!
I had 2 "paired" DIMMs and one "rogue" with slightly different timings.
I could never find anything really *wrong* with that "odd" one, but when I
leave that one out, the system works like a charm.

There are a multitude of possible causes for this.

It could the differences between the DIMMs that causes this, it might
not handle that many "sides" or it might require slowing down memory
accesses with that many "sides" (standard DIMMs can have one or two
sides).

Personally I'd suspect that the most likely cause is the difference
between the DIMMs, and that either rearranging the DIMMs (so that it
sees the "slower" first, unless they have *different* slow parameters.
Which way it scans is totally undocumented, and it SHOULD query all of
them, but in reallity this does help surprisingly often) or manually
settting down the memory speed slightly (CAS, speed or one of the
other parameteres).

The second most likely cause is that you need to reduce memory speed
due to too many sides, the reason I list this as less likely is that
this is something that the BIOS almost always gets right without help.
But check the manual and see what it says about memory.

I usually use Memtest86+ to verify that it works. It takes time (the
longer the better, let it run overnight), and isn't guaranteed to
always catch all errors, but it's fairly good.

It also shows what memory speed settings are used, so you can easily
see if the setting changes as you rotate the three dimms (three
tests).

(The original Memtest86 is also pretty good and they now trade
information back and forth, I find the + version still to be better).

http://www.memtest.org/