Dl385 Corrected Memory Error Threshold Exceeded
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Corrected Memory Error Threshold Exceeded ((processor 2 Memory Module 6))
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hundreds to thousands of times higher than thought -- a mean of 3,751 correctable errors per DIMM per year. Another piece of uncorrectable memory error ((processor 1 memory module 3)) hallowed Conventional Wisdom bites the dust. Google and Prof. Bianca Schroeder teamed
Uncorrectable Memory Error (system Memory, Memory Module 0)
up on the world's first large-scale study of RAM errors in the field. They looked at multiple vendors, DRAM
Correctable Memory Error Rate Exceeded For Dimm
densities and DRAM types including DDR1, DDR2 and FB-DIMM. Every system architect and motherboard designer should read it. And I agree with James Hamilton’s suspicion that even clients need ECC http://h20564.www2.hp.com/hpsc/doc/public/display?docId=mmr_kc-0100555 - at least heavily used clients. If you can’t trust DRAM . . . Here are some hard numbers from DRAM Errors in the Wild: A Large-Scale Field Study by Bianca Schroeder, U of Toronto, and Eduardo Pinheiro and Wolf-Dietrich Weber, Google. What you don’t know can hurt you Most DIMMs don’t include ECC because it costs more. Without ECC https://storagemojo.com/2009/10/10/nightmare-on-dimm-street/ the system doesn’t know a memory error has occurred. Which is part of the reason people aren’t more concerned. Ignorance is bliss. Everything is fine until a memory error means a missed memory reference or a flipped bit in file metadata writing to disk. What you see is a “file not found” or a “file not readable” message, silent data corruption - or even a system crash. And nothing that says “memory error.” Conventional Wisdom The industry take on DRAM is summed in a quote from an old AnandTech FAQ that took the industry at its word: Everyone can agree that hard errors are fairly rare. . . . For the frequency of soft errors. . . . IBM stated . . . that at sea level, a soft error event occurs once per month of constant use in a 128MB PC100 SDRAM module. Micron has stated that it is closer to once per six months . . . . An even bigger surprise: it appears that hard errors, not soft errors, are the dominant error mode - the
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Forgot password? Don’t have an account? Sign Up Manuals > Brands > HP Manuals > Server > HP ProLiant DL385 G2 Server > HP Advanced Memory Error Detection Technology 1 2 3 4 5 6 7 8 2 Introduction Across the industry, memory errors have increased significantly due to the growth in overall server memory capacity and the increase in the number of bits per DRAM chip. Uncorrectable memory errors can cause applications and operating systems to crash, so they are costly in terms of downtime and repairs. Over the past 18 years, HP has introduced several memory technology innovations to ensure data reliability and protection. In 1999, we introduced the Pre-Failure Alert notification system to monitor and predict potential problems with critical components such as system memory modules (DIMMs). The notification system sends an alert to a system administrator when a DIMM exceeds a predefined threshold for correctable memory errors. This lets the administrator schedule server maintenance to replace a DIMM that may fail, avoiding unexpected interruption of business operations. In the ProLiant System ROM upgrade (version May 2011 or later), we have enhanced protection with HP Advanced Memory Error Detection Technology. This innovation seeks out specific defects that either cause performance degradation or significantly increase the probability of an uncorrectable (non-recoverable) memory condition. By improving the prediction of non-recoverable memory events, this technology prevents unnecessary DIMM replacements and increases server uptime. This paper details the enhancements in and advantages of HP Advanced Memory Error Detection Technology. It begins with a description of Synchronous DRAM (SDRAM) technology and memory errors, and it explains why memory errors are occurring more frequently. SDRAM technology A standard Error Correction Code (ECC) DDR3 DIMM delivers 72 bits at a time to a memory bus. The 72-bit data block—a 64-bit data word and 8 bits of ECC—is called a rank. As shown in Figure 1, one rank consists of data from nine DRAM chips that provide 8 bits each (called x8 or “by 8” chips) or 18 DRAM chips that provide 4 bits each (x4 chips). DIMMs are classified as single-rank, dual-rank, or quad-rank (not shown). Quad-ranked DIMMs can have 72 x4 DRAM chips or 36 x8 DRAM chips, including ECC chips. Memory manufacturers use multiple ranks to increase the capacity of DIMMs per memory channel. Today, a quad-ranked DDR3 DIMM with 4 Gb DRAM chips has a usable capacity of 32 GB. Figure 1: Single-sided and double-sided SDRAM DIMMs and c