Corrected Memory Error Detected
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Memtest Memory Error Detected
Correctable and Uncorrectable March 24, 2011By RamdevMemory errors are quite common hardware related errors in enterprise environment, here we are going to discuss about two common types memory error detected copying between of errors …. Correctable Memory Errors Symptoms: Your system may have one or more of the following symptoms. The system may have received CE, ECC errors, or recoverable memory errors. The system may be described as having reported CPU or memory errors Example error messages which may have been reported are shown below: Name(required) Email(required) Learning Request(required) Are you Looking for (required) Paid Training Free Training What is your Learning Goal for Next Six Months ? Talk to us
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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 that data is not corrupted (changed), either coming from or going to the hardware or in 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 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 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 o