[san-tech][01877] Re: DRAM信頼性についての報告

Date: Sun, 11 Oct 2009 12:42:56 +0100
------------------------------------------------
[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
----------------------------------------
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"
---------------------------------------
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/
------------------------------------------------
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/