[Gllug] Error correcting memory

[Chris Bell]

On Mon 26 May, Mike Brodbelt wrote:
> 
> On Mon, 2003-05-26 at 19:53, Chris Bell wrote:
> > Hello,
> >    I am setting up a Digital Prioris XL Server, and also have a Hewlett
> > Packard NetServer E60, both of which have 9-chip error correcting SIMMs. Can
> > someone please tell me which errors can be corrected? Are they limited to
> > errors inherent to the SIMMs, or the whole system, perhaps including disc
> > errors?
> 
> ECC memory is capable of correcting single bit errors. Where a memory
> cell in the SIMM becomes corrupted, normal memory will provide invalid
> data to the CPU when the cell is read, ECC memory will notice the
> checksum for that byte is incorrect, and transparently correct it. This
> is most often specified for servers and systems where reliability is
> key. Memory can become corrupted due to background radiation, degrading
> electronics, etc.
> 
> ECC cannot correct errors anywhere other than in the memory modules -
> CPU/disk errors are entirely unaffected.
> 
> Mike.

   Thanks for the info, it was as I expected, I did not think that 9 bits
would be used everywhere on the motherboard, (although I have not noticed
any problems with ordinary memory).

-- 
Chris Bell



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