Multi-bit Status An Uncorrectable Error Occurred
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Single-bit Failure Error Rate Exceeded
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Correctable Memory Error Log Limit Reached
Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Multibit error encountered on Dell Server Memory up vote 3 down vote favorite Dell OpenManage reported the following: Memory device status is critical Memory device location: DIMM_B2 Possible memory module event cause:Multi bit error encountered What persistent correctable memory error rate has increased for a memory device at location does this mean? How bad is it? memory dell dell-openmanage share|improve this question asked Sep 5 '13 at 14:02 AXE-Labs 6511716 Call Dell Support, send it back as faulty. –Tom O'Connor Sep 5 '13 at 14:06 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote The event message reference for this was 1404. It indicates a faulty DIMM that should be replaced but from what I read on blogs, the alert often clears and does not come back after reboots. Since it only tripped once for me, I cleared the memory errors using OMSA (dcicfg32.exe) and so far so good. share|improve this answer answered Sep 5 '13 at 14:02 AXE-Labs 6511716 This was a good move - replacement typically isn't warranted after a single occurrence, though I'd seriously consider it if the problem ever returns on that particular DIMM. –JimNim Sep 6 '13 at 14:52 Similarly, I was seeing "Single bit warning error rate exceeded" and "Single bit failure error rate exceeded" on a Li
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» Articles » Monitoring Memo... Login Error Detection and Correction Jeff Layton Data protection and checking takes place various places throughout a system. Some of it is in hardware and some of it is in software. The goal is to ensure http://www.admin-magazine.com/Articles/Monitoring-Memory-Errors that data is not corrupted (changed), either coming from or going to the hardware or in http://www.intelligentmemory.com/support/faq/ecc-dram/how-often-do-ecc-correctable-single-bit-errors-occur-and-how-about-double-multi-bit-errors.php the software stack. One key technology is ECC memory (error-correcting code memory).The standard ECC memory used in systems today can detect and correct what are called single-bit errors, and although it can detect double-bit errors, it cannot correct them. A simple flip of one bit in a byte can make a drastic difference in the value of the byte. For example a byte (8 memory error bits)with a value of 156 (10011100)that is read from a file on disk suddenly acquires a value of 220 if the second bit from the left is flipped from a 0 to a 1 (11011100) for some reason.ECC memory can detect the problem and correct it so with the user unaware. Notice, however, that only one bit in the byte has been changed and then corrected. If two bits change – perhaps by both the second and seventh from correctable memory error the left – the byte is now 11011110 (i.e., 222); typical ECC memory can detect that the “double-bit” error occurred, but it cannot correct it. In fact, when a double-bit error happens, memory should cause what is called a “machine check exception” (mce), which should cause the system to crash. After all, you are using ECC memory, so ensuring the data is correct is important; if an uncorrectable memory error occurs, you would probably want the system to stop.The source of bit-flipping usually originates in some sort of electrical or magnetic interference inside the system. This interference can cause a bit to flip at seemingly random times, depending on the circumstances. According to the Wikipedia article and a paper on single-event upsets in RAM, most single-bit flips are the result of background radiation – primarily neutrons from cosmic rays.The same Wikipedia article reports that the error rates reported from 2007 to 2009 varied all over the map, ranging from 10–10 (errors/bit-hr) to 10–17 (seven orders of magnitude difference). The lower number is just about one error per gigabit of memory per hour. The upper number indicates roughly one error every 1,000 years per gigabit of memory.A study of real memory errors took place at Google. During their investigations they found that one third of the machines and more than 8 percent of the DIMMs saw correctable errors per year. This translates to Google experiencing about 25,000–75,000 corr
Mobile DDR Support FAQ Downloads Partner Where to buy About Contact Go FAQ Home FAQ How often do ECC-correctable single-bit errors occur and how about double/multi-bit errors? Fact is: DRAM components are not perfect. Some databits inside every DRAM will flip from 0 to 1 or from 1 to 0 from time to time. There are multiple analyses and statistics about how often bit-flips in DRAMs occur, but none of them can be used universally for all applications. One interesting research comes from the University Of Toronto and is called 'DRAM Errors in the Wild - A large scale field study'. This study monitored the DRAM errors in the thousands of systems of the famous Google server-farm for a period of 2 1/2 years. All those servers were surely perfectly air-conditioned, dust-free and protected from radiations of all kinds. Still they came to the result of 25000 to 70000 FIT (failures per billion device hours) of 'ECC correctable errors' per Megabit of DRAM. This converts into an average of one single-bit-error every 14 to 40 hours per Gigabit of DRAM. The field study also explains that the error-rate increases by the age of the memory. Brandnew DRAMs might not show any errors for weeks and months, but then the error-rate suddenly goes up. Uncorrectable errors could be double- or multi-bit errors or complete functional fails of the DRAM. These can all not be corrected, but are extremely rare. A 1 Gigabit ECC DRAM contains 16 Million blocks of 64 bit datawords. Per each of these 64 bit words, one error is correctable. In other words: Statistically one out of 16 million hits might be a double-bit error. If one error hits per day, this would mean that it takes hypothetically 16 Million days or 48000 years for a double-bit error to hit. But this is just the maths. Finally the real numbers depend on the stress and the environment the application is running in. FAQ Index Our Products Product News DRAM ECC DRAM ECC DRAM eXtra Robustness Memory Modules Certification Contact Us info@intelligentmemory.com +852 2422 0422 http://www.intelligentmemory.com Newsletter Subscribe to our newsletter and stay up to date with the latest news and deals! Subscribe 2016 © I'M Intelligent Memory | Privacy Policy | Terms of S