Parity Error Detected In Data In
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Catalyst 6500 Series SwitchesTroubleshoot and AlertsTroubleshooting TechNotes Parity Errors Troubleshooting Guide Download Print Available Languages Download Options PDF (259.4 KB) View with Adobe Reader on a variety of parity checking devices Updated:Jul 15, 2013 Document ID:116135 Document ID: 116135 Updated: Jul 15, checksum error detection 2013 Contributed by Shawn Wargo, Cisco Engineering. Download PDF Print Feedback Related ProductsCisco Catalyst 6500 Series Switches ContentsIntroductionBackgroundSoft parity bit ErrorsHard ErrorsCommon Error MessagesProcessorRAMASICLatest AdvancementsProcessorRAMASICSoftwareMSFC IBC Reset6700 Series 'Single-Bit Parity Error' ResetRecommendationsSoft Errors (SEU)Environmental AuditLatest Firmware (Rommon)Thumb ScrewsHard Errors (Malfunction)Hardware (MTBF and EOL) AuditHardware DiagnosticsRelated Cisco Support Community DiscussionsIntroductionThis document describes soft parity error cisco and hard parity errors, explains common error messages, and recommends methods that help you avoid or minimize parity errors. Recent improvements in hardware and software design reduce parity problems as well. BackgroundWhat is a processor or memory parity error?Parity checking is the storage of an extra binary digit (bit) in order to represent the parity (odd or even) of a small amount of computer data
Hamming Code
(typically one byte) while that data is stored in memory. The parity value calculated from the stored data is then compared to the final parity value. If these two values differ, this indicates a data error, and at least one bit must have been changed due to data corruption.Within a computer system, electrical or magnetic interference from internal or external causes can cause a single bit of memory to spontaneously flip to the opposite state. This event makes the original data bits invalid and is known as a parity error.Such memory errors, if undetected, may have undetectable and inconsequential results or may cause permanent corruption of stored data or a machine crash.There are many causes of memory parity errors, which are classified as either soft parity errors or hard parity errors.Soft ErrorsMost parity errors are caused by electrostatic or magnetic-related environmental conditions.The majority of single-event errors in memory chips are caused by background radiation (such as neutrons from cosmic rays), electromagnetic interference (EMI), or electrostatic discharge (ESD). These events may randomly change the electrical state of one or more memory cells or may interfere with the circuitry used to read and write
citations to reliable sources. Unsourced material may be challenged and removed. (August 2008) (Learn how and when to remove this template message) In information theory and coding theory with applications in computer science and telecommunication, error
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detection and correction or error control are techniques that enable reliable delivery of parity meaning digital data over unreliable communication channels. Many communication channels are subject to channel noise, and thus errors may be introduced during what is parity transmission from the source to a receiver. Error detection techniques allow detecting such errors, while error correction enables reconstruction of the original data in many cases. Contents 1 Definitions 2 History 3 Introduction 4 http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/116135-trouble-6500-parity-00.html Implementation 5 Error detection schemes 5.1 Repetition codes 5.2 Parity bits 5.3 Checksums 5.4 Cyclic redundancy checks (CRCs) 5.5 Cryptographic hash functions 5.6 Error-correcting codes 6 Error correction 6.1 Automatic repeat request (ARQ) 6.2 Error-correcting code 6.3 Hybrid schemes 7 Applications 7.1 Internet 7.2 Deep-space telecommunications 7.3 Satellite broadcasting (DVB) 7.4 Data storage 7.5 Error-correcting memory 8 See also 9 References 10 Further reading 11 External links Definitions[edit] The https://en.wikipedia.org/wiki/Error_detection_and_correction general definitions of the terms are as follows: Error detection is the detection of errors caused by noise or other impairments during transmission from the transmitter to the receiver. Error correction is the detection of errors and reconstruction of the original, error-free data. History[edit] The modern development of error-correcting codes in 1947 is due to Richard W. Hamming.[1] A description of Hamming's code appeared in Claude Shannon's A Mathematical Theory of Communication[2] and was quickly generalized by Marcel J. E. Golay.[3] Introduction[edit] The general idea for achieving error detection and correction is to add some redundancy (i.e., some extra data) to a message, which receivers can use to check consistency of the delivered message, and to recover data determined to be corrupted. Error-detection and correction schemes can be either systematic or non-systematic: In a systematic scheme, the transmitter sends the original data, and attaches a fixed number of check bits (or parity data), which are derived from the data bits by some deterministic algorithm. If only error detection is required, a receiver can simply apply the same algorithm to the received data bits and compare its output with the received check bits; if the values do not match, an error has occurred at some p
- China India 日本 - Japan 대한민국 - Korea 台灣 - Taiwan Remember my choice Solutions Products & https://kb.juniper.net/index?page=content&id=KB18931&actp=RSS Services Company Partners Support Education Community Security Intelligence Center Knowledge Center https://lists.freebsd.org/pipermail/freebsd-scsi/2003-August/000500.html - Browse All Missing key: null Knowledge Base TechNotes Security Advisories Technical Bulletins Pages: 67 [ 1 2 3 4 5 … 67 | Next ] Status ID Title Views Last Updated Unread KB19444 How to let FTPS pass though a SRX device 223,945 16 parity error hours ago Unread KB21052 [SRX] Update IDP in the secondary node of a SRX Chassis Cluster (High Availability) 195,032 16 hours ago Unread KB6319 [ScreenOS] How to insert secondary IP of an interface in OSPF routing table 52,853 1 day ago Unread KB31210 [ScreenOS] How to interpret the output for 'get route summary' 112 parity error detected 2 days ago Unread KB31228 [Space] How to restart JBOSS 198 3 days ago Unread KB19367 [Archive] [Junos Space] Which Virtual Machine system works with Junos Space 13.3? 58,803 4 days ago Unread KB31081 [SRX] Example – Configure Ethernet Switching in SRX 1,514 4 days ago Unread KB31147 [SRX] Example - Configure Transparent mode on Junos 15.1X49 SRX platform 824 4 days ago Unread KB21476 JTAC Recommended Junos Software Versions 7,472,176 6 days ago Unread KB8533 [ScreenOS] Juniper ScreenOS Firewall LAN-to-LAN Route Based VPN articles 523,719 8 days ago Unread KB21421 [SRX] Configuration Example - Transparent mode on SRX platforms 342,365 8 days ago Unread KB25209 [ScreenOS] TCP session close notification fail with Windows FTP server 11,253 8 days ago Unread KB25207 [ScreenOS] How to configure L2TP on an Android phone 11,962 8 days ago Unread KB4103 [ScreenOS] Configuring WebAuth 101,657 8 days ago Unread KB7315 [ScreenOS] What is the URL for the Deep Inspection Attack dat
during kernel boot encountered. Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Greetings, I have an HP Proliant 380GL-D3 running 4.8-STABLE and, for the time being, a GENERIC kernel. I also have an external Compaq Storageworks DLT bay. Both the server and the tape bay both have two SCSI ports, and of course it was only the final combination that made anything happen. I have the storage bay powered up, and the DLT settles down and shows a single green led. I then power up the server and after it gets to booting the kernel, the following messages appear on the console: (probe30:ahc1:0:0:0): parity error detected in DT Data-in phase. SEQADDR(0x1a5) SCSIRATE(0x0) Unexpected non-DT Data Phase (probe30:ahc1:0:0:0): parity error detected in DT Data-out phase. SEQADDR(0x1a6) SCSIRATE(0x0) Unexpected non-DT Data Phase (probe30:ahc1:0:0:0): parity error detected in DT Data-out phase. SEQADDR(0x1a6) SCSIRATE(0x0) Unexpected non-DT Data Phase (probe30:ahc1:0:0:0): parity error detected in DT Data-out phase. SEQADDR(0x1a5) SCSIRATE(0x0) Unexpected non-DT Data Phase After several thousand of these go by, I get the following (retrieved from dmesg): (probe30:ahc1:0:0:0): SCB 0x8 - timed out >>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<< ahc1: Dumping Card State while idle, at SEQADDR 0x16b Card was paused ACCUM = 0x8, SINDEX = 0x81, DINDEX = 0xe4, ARG_2 = 0x2 HCNT = 0x0 SCBPTR = 0x0 SCSIPHASE[0x1]:(DATA_OUT_PHASE) SCSISIGI[0x36]:(REQI|BSYI|ATNI|MSGI) ERROR[0x0] SCSIBUSL[0x0] LASTPHASE[0x1]:(P_BUSFREE) SCSISEQ[0x12]:(ENAUTOATNP|ENRSELI) SBLKCTL[0xa]:(SELWIDE|SELBUSB) SCSIRATE[0x0] SEQCTL[0x10]:(FASTMODE) SEQ_FLAGS[0x40]:(NO_CDB_SENT) SSTAT0[0x2]:(SPIORDY) SSTAT1[0x5]:(REQINIT|SCSIPERR) SSTAT2[0x1]:(DUAL_EDGE_ERR) SSTAT3[0x0] SIMODE0[0x8]:(ENSWRAP) SIMODE1[0xac]:(ENSCSIPERR|ENBUSFREE|ENSCSIRST|ENSELTIMO) SXFRCTL0[0x88]:(SPIOEN|DFON) DFCNTRL[0x0] DFSTATUS[0x8a]:(FIFOFULL|HDONE|PRELOAD_AVAIL) STACK: 0x34 0x34 0x34 0x16a SCB count = 20 Kernel NEXTQSCB = 7 Card NEXTQSCB = 7 QINFIFO entries: Waiti