Date: Sun, 11 Oct 2009 12:42:56 +0100
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[san-tech][01874] DRAM信頼性についての報告
StorageMojoの Robin Harrisさんは、本家ではなく ZDNetで取り上げてます:
"DRAM error rates: Nightmare on DIMM street", October 4th, 2009
http://blogs.zdnet.com/storage/?p=638&tag=col1;post-638
"A two-and-a-half year study of DRAM on 10s of thousands Google servers
found DIMM error rates are hundreds to thousands of times higher
than thought - a mean of 3,751 correctable errors per DIMM per year."
Table 1: Memory errors per yera:
http://i.zdnet.com/blogs/picture-27.png
元論文の表を切り出してます。
今見たら StorageMojoでフォローしています
"Nightmare on DIMM street", Saturday, 10 October, 2009
http://storagemojo.com/2009/10/10/nightmare-on-dimm-street/
"Note: Much of this was published on ZDnet Sunday night. This version
is updated after speaking to Prof. Schroeder Wednesday. This version
also dispenses with some consumer-oriented content.
こちらでも取り上げられています:
Paper about DRAM error rates - Chromium-dev | Google グループ
2009年10月6日~
http://groups.google.com/group/chromium-dev/browse_thread/thread/a52d8ab8703fd7ef
"Google: Computer memory flakier than expected", October 7, 2009
http://news.cnet.com/8301-30685_3-10370026-264.html
コメント欄より
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but PRAM (if it ever gets shipped commercially in volume) will be worse
than DRAM. Much, much worse! Read this NASA report (page 8)::
"Memory Investigation for a Europa Exploer Mission Concept",
JPL D‐48262, 22 September 2008.
http://opfm.jpl.nasa.gov/files/MEMORY%20INVESTIGATION%20for%20JEO%20MISSION%20D48262_revA_CL.pdf
"JPL has experienced one error in six BAE CRAM [the only "commercially
available" PRAM at that time] devices tested. The cause of the error
has not been determined; recall that the devices checked were
engineering evaluation samples provided as a courtesy to JPL and were
unscreened at the factory"
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詳細は:
"How to spot a fake: Samsung and PRAM", May 5, 2009
http://ecdfan.blogspot.com/2009/05/how-to-spot-fake-samsung-and-pram.html
上記ミッション
Outer Planet Flagship Mission
http://opfm.jpl.nasa.gov/
Radiation Study Reports Library
http://opfm.jpl.nasa.gov/library/radiationstudyreportslibrary/
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Date: Mon, 12 Oct 2009 18:45:43 +0100
The Registerでも取り上げられました
"Google: Servers are DIMM witted", 12th October 2009
http://www.theregister.co.uk/2009/10/12/google_server_memory/
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