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Re: ECC RAM really needed?

From: Michael Stone <mstone+postgres(at)mathom(dot)us>
To: Craig James <craig_james(at)emolecules(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: ECC RAM really needed?
Date: 2007-05-26 12:43:15
Message-ID: 20070526124313.GU1785@mathom.us (view raw or flat)
Thread:
Lists: pgsql-performance
On Fri, May 25, 2007 at 06:45:15PM -0700, Craig James wrote:
>We're thinking of building some new servers.  We bought some a while back 
>that have ECC (error correcting) RAM, which is absurdly expensive compared 
>to the same amount of non-ECC RAM.  Does anyone have any real-life data 
>about the error rate of non-ECC RAM, and whether it matters or not?  In my 
>long career, I've never once had a computer that corrupted memory, or at 
>least I never knew if it did. 

...because ECC RAM will correct single bit errors. FWIW, I've seen *a 
lot* of single bit errors over the years. Some systems are much better 
about reporting than others, but any system will have occasional errors. 
Also, if a stick starts to go bad you'll generally be told about with 
ECC memory, rather than having the system just start to flake out. 

Mike Stone

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