Dimm Error Rate
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computer data storage that can detect and correct the most common kinds of internal data corruption. ECC memory is used in most computers where data corruption cannot be tolerated under any circumstances, such as for scientific or financial computing. correctable memory error rate exceeded for dimm Typically, ECC memory maintains a memory system immune to single-bit errors: the data that is
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read from each word is always the same as the data that had been written to it, even if one or more bits
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actually stored have been flipped to the wrong state. Most non-ECC memory cannot detect errors although some non-ECC memory with parity support allows detection but not correction. Contents 1 Problem background 2 Solutions 3 Implementations 4 Cache 5
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Registered memory 6 Advantages and disadvantages 7 References 8 External links Problem background[edit] Electrical or magnetic interference inside a computer system can cause a single bit of dynamic random-access memory (DRAM) to spontaneously flip to the opposite state. It was initially thought that this was mainly due to alpha particles emitted by contaminants in chip packaging material, but research has shown that the majority of one-off soft errors in DRAM chips occur as a result of dimm error message background radiation, chiefly neutrons from cosmic ray secondaries, which may change the contents of one or more memory cells or interfere with the circuitry used to read or write to them.[2] Hence, the error rates increase rapidly with rising altitude; for example, compared to the sea level, the rate of neutron flux is 3.5 times higher at 1.5km and 300 times higher at 10–12km (the cruising altitude of commercial airplanes).[3] As a result, systems operating at high altitudes require special provision for reliability. As an example, the spacecraft Cassini–Huygens, launched in 1997, contains two identical flight recorders, each with 2.5gigabits of memory in the form of arrays of commercial DRAM chips. Thanks to built-in EDAC functionality, spacecraft's engineering telemetry reports the number of (correctable) single-bit-per-word errors and (uncorrectable) double-bit-per-word errors. During the first 2.5years of flight, the spacecraft reported a nearly constant single-bit error rate of about 280errors per day. However, on November 6, 1997, during the first month in space, the number of errors increased by more than a factor of four for that single day. This was attributed to a solar particle event that had been detected by the satellite GOES 9.[4] There was some concern that as DRAM density increases further, and thus the components on chips get smaller, while at the same time operating voltages continue to fall, DRAM chips will be affe
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? Ask a question, help others, and get answers from the community Discussions Start a thread and discuss today's topics with top experts Blogs Read the latest tech blogs written by experienced community members Why do DIMM cards fail so often in servers Jim4522 http://itknowledgeexchange.techtarget.com/itanswers/why-do-dimm-cards-fail-so-often-in-servers/ 820 pts. Tags: Thanks! We'll email youwhen relevant content isadded and updated. Following Follow DIMM cards Recently I have been doing a study of the rate of failure of server components. It probably won’t shock anyone that the most failing component is the disk drive given its electrical/mechanical nature. What I do find surprising is that running a very close second are DIMM memory cards. I would assume that they are completely electronic and therefore error rate should be fairly high on the reliability scale but they are not. The disk drives average a failure every 500 plus months of server use and the DIMM cards are approximately 1000 months between failures which is only twice as good as disk drives. Does anyone have an idea as to why DIMM cards would be so failure prone? Jim White Asked: September 9, 20088:18 PM Last updated: September 28, 20088:02 PM Related Questions Which of correctable memory error the following can a user reasonably do for himself How do you replace DIMM cards? Best RAID for Database Server Fail over with two disk hardware mirror Installed RAM vs total RAM shown Answer Wiki Last updated: September 28, 20088:02 PM GMT Flame14,925 pts. History Contributors Ordered by most recent Flame14,925 pts. Thanks. We'll let you know when a new response is added. By your calculations, the average hard drive should last over 41 years (500/12) and a DIMM module would last over 82 years. (1000/12). Considering that the average life of a server is around 4 or 5 years, I don't see either of these numbers you supplied as "failure prone" In my experience, and believe many others will agree, the first parts that fail are mechanical i.e. Hard drives and fans. A major cause for component failure, other that mechanical, is generally heat (often times because of a failed fan…) This is just a theory, but processors are the focus of the cooling systems in a computer, as it the power supply. Often there is a heat sink on the north bridge chip and video cards as well. These cooling systems keep component at a relatively regulated temp when operating. RAM on the other hand has no cooling system, now generally RAM does not run that hot but repeated hot/cold cycles can c