RE: new utility for decoding salinfo records

From: Luck, Tony <>
Date: 2005-01-12 08:23:48
>1) almost all nodes get some SBEs once in a while. Over time these
>accumulate in the directory. We don't consider this to be a problem.
>Gamma rays do happen and if you have a big enough target and 
>you sample for a long enough time, you are bound to catch a few.

<nitpick>The bit flips are more likely the result of neutrons than
gamma rays ... though the neutrons in question were produced by "cosmic"
rays hitting the upper atmosphere.</nitpick>

>Do other people consider 1SBE/hr on a DIMM a real problem that needs to
>be fixed?

That's way too high for background neutrons.  Possibly a DIMM that
got zapped by a static discharge sometime in its life?  Or just a
manufacturing defect small enough to get past the normal testing

Whether it is a problem depends on the liklihood of it cascading into
a multi-bit error ... for which I don't have any data.

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Received on Tue Jan 11 17:42:02 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:34 EST