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Topic: MTBF

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	What is MTBF? - A Word Definition From the Webopedia Computer Dictionary
		MTBF ratings are measured in hours and indicate the sturdiness of hard disk drives and printers.
		Disk drives are typically tested only a few hours, and it would be unlikely for a failure to occur during this short testing period.
		Because of this, MTBF ratings are also predicted based on product experience or by analyzing known factors such as raw data supplied by the manufacturer.
	www.webopedia.com /TERM/M/MTBF.html (142 words)

	Mean time between failures - Biocrawler (Site not responding. Last check: )
		The MTBF is a commonly-quoted reliability statistic, and is usually expressed in hours (even intervals on the order of years are instead typically expressed in terms of thousands of hours).
		The MTBF applies only within the service life of a product (that is, after burn in and before the end of its service life).
		MTBF may be quoted for individual components (for example, a chip) where the failure is defined as the component no longer working properly.
	www.biocrawler.com /encyclopedia/MTBF (958 words)

	StorageReview.com - Tiki : MTBF
		MTBF is the "mean time between failures," that is, the average elapsed time that passes before a failure occurs in a batch of drives under intense test conditions.
		Rather, MTBF is a product of a large quantity of drives (numbering in the hundreds or low thousands, perhaps) and the number of hours that such a batch runs before experiencing a failure.
		MTBF should be regarded as a minimum statement of reliability by the manufacturer.
	www.storagereview.com /php/tiki/tiki-index.php?page=MTBF (362 words)

	What is MTBF? (Site not responding. Last check: )
		MTBF numbers can also be lowered by excessive vibration or by many forms of misuse.
		MTBF numbers are generally created by estimating the MTBF of individual components and by past experience with similar products.
		MTBF numbers can be generated for a datacenter or IT shop by looking at a historical record of service outages.
	www.tech-faq.com /mtbf.shtml (391 words)

	Mean time between failure - Wikipedia, the free encyclopedia
		Mean-time-between-failure (MTBF) is the "average" time between failures, the reciprocal of the failure rate in the special case when failure rate is constant.
		A common misconception about the MTBF is that it specifies the time (on average) when the likelihood of failure equals the likelihood of not having a failure.
		For typical distributions with some variance, MTBF only represents a top-level statistic, thus is not suitable for predicting detailed time of failure, as the uncertainty in actual failure distribution manifests itself in variability in the time to failure distribution.
	en.wikipedia.org /wiki/MTBF (393 words)

	ABOUT MTBF (Medium Term Budgetary Framework) (Site not responding. Last check: )
		Reliable estimates of resources available for expenditure over the MTBF period are required, as government spending plans must respect a reasonable view of what government revenues are likely to be over the medium term.
		The economic forecast relevant to the MTBF is the estimate of annual economic growth over the medium term prepared for the government of Pakistan and usually reflected in the annual budget.
		If a federal state is to derive maximum benefit from an MTBF approach it is very important that all levels of government share information on policy priorities and maintain common reporting standards so that meaningful information can be compiled on how government spending at all levels supports government priorities.
	www.mtbfpakistan.gov.pk /about_mtbf.htm (3851 words)

	[No title]
		MTBF is the inverse of the failure rate in the constant failure rate phase.
		MTBF is, therefore an excellent characteristic for determining how many spare hard drives are needed to support 1000 PC's, but a poor characteristic for guiding you on when you should change your hard drive to avoid a crash.
		MTBF need not, then be "Mysterious Time Between Failures" or "Misleading Time Between Failures", but an important system characteristic which can help to quantify the suitability of a system for a potential application.
	www.ece.cmu.edu /~ganger/ece546.spring02/readings/mtbf.description (1009 words)

	MTBF calculation
		In the case of a new or significantly changed design, an accepted technique is to estimate MTBF using a recognized model.
		For mechanical MTBF prediction NSWC-94/L07 from the David Taylor Research Center is the most widely used model.
		For example, if your system has a predicted MTBF of 1000 hours, this means that, on average, your system experiences one failure in 1000 hours of operation.
	www.lambdacorp.com /html/mtbf.html (470 words)

	Mean Time Between Failures (MTBF)
		To be interpreted properly, the MTBF figure is intended to be used in conjunction with the useful service life of the drive, the typical amount of time before the drive enters the period where failures due to component wear-out increase.
		Theoretical MTBF figures also cannot typically account for "random" or unusual conditions such as a temporary quality problem during manufacturing a particular lot of a specific type of drive.
		Overall, MTBF is what I consider a "reasonably interesting" reliability statistic--not something totally useless, but definitely something to be taken with a grain of salt.
	www.storagereview.com /guide2000/ref/hdd/perf/qual/specMTBF.html (834 words)

	Embedded.com - Using MTBF to Analyze Bus Reliability
		MTBF analysis techniques can be tapped to prove that star bus architectures significantly outperform multi-drop parallel busses in communication node designs.
		If the MTBF of the bus-related failure mechanisms are known, then the MTBF of the CMs could be replaced with the bus-related MTBF which would be higher than the MTBF of the entire module.
		In most cases the bus-related MTBF is not known in which case the MTBF of the module must be used (i.e.
	www.embedded.com /showArticle.jhtml?articleID=22102999 (3270 words)

	Reliability Prediction to Calculate Failure & Calculating MTBF
		In general, MTBF (Mean Time Between Failures) is the mean value of the lengths of time between consecutive failures, under stated conditions, for a stated period in the life of a functional unit.
		A more simplified MTBF definition for Reliability Predictions can be stated as the average time (usually expressed in hours) that a component works without failure.
		MTBF (Mean Time Between Failures) for an existing product can be found by studying field failure data.
	www.relex.com /resources/prediction.asp (520 words)

	MTBF - Mean Time Between Failure
		MTBF is not related with items like expected and/or operating life or other items that in general are not fixed or replacement even though it sometimes may be.
		Increases in MTBF may not necessarily result with a proportional rise in reliability.
		MTBF is not the correct tool for all applications, but is a useful measurement of reliability.
	www.sixsigmaspc.com /dictionary/MTBF-meantimebetweenfailure.html (233 words)

	8.4.5.1. Constant repair rate (HPP/exponential) model
		It is easy to plan tests, estimate the MTBF and calculate confidence intervals when assuming the exponential model.
		The method used for estimation is the same for the HPP model and for the exponential population model.
		This estimate is the maximum likelihood estimate whether the data are censored or complete, or from a repairable system or a non-repairable population.
	www.itl.nist.gov /div898/handbook/apr/section4/apr451.htm (732 words)

	Techworld.com - OS and Servers Briefings - MTBF: what lifespan can you expect?
		MTBF is properly used only for components that can be repaired and returned to service.
		MTBF is a statistical measure, and as such, it can't predict anything for a single unit.
		The MTBF figure for a product can be derived from laboratory testing, actual field failure data or prediction models such as MIL-HDBK-217 (the Military Handbook for Reliability Prediction of Electronic Equipment, published by the US Department of Defense).
	techworld.com /opsys/features/index.cfm?featureid=1944&... (953 words)

	Frequenty Asked Question Reliability - MTBF (Site not responding. Last check: )
		First, The MTBF parameter is defined as the total functioning life of a population of an item during a specific measurement interval, divided by the total number of failures within the population during that interval.
		Mostly, the MTBF calculation is made upon hardware tree of the system (based on the Bill Of Materials), while FMECA performs analyze for a logical tree.
		While in the MTBF calculation every Failure Rate of each component is simply summed up to the general system’s failure rate, in the FMECA each component/function may affect on several other items.
	www.bqr.com /faq/faq.htm (1459 words)

	Calculating MTBF
		MTBF) for the data modeled as a Failure -Renewal process following a HPP (homogeneous Poisson process) This is where the failure rate (lambda) is constant.
		The cumulative MTBF on an interval (0,100) in that case is given by Theta = x(pwr 1-Beta) / lambda where Beta and Lambda are parameters of the intensity function estimated from the data.
		The instantaneous MTBF at failure time x= 100 is same formula except the divisor is multiplied by Beta (x to the 1-Beta power divided by (Lambda times Beta) and becomes 41.36.
	www.isixsigma.com /forum/showsponsormessage.asp?messageID=71613 (729 words)

	SIXNET Industrial Ethernet Solutions
		> These MTBF numbers are based on data for a sampling of units over a time span of one year.
		Finally, to get the MTBF we divide the total number of unit operating hours by the number of applicable failures.
		An applicable failure is one that cannot be attributed to misuse (i.e.
	www.sixnetio.com /html_files/products_and_groups/mtbf_connect.htm (305 words)

	MTBF: Misquoted and Misunderstood - 3/1/2005 - ECN (Site not responding. Last check: )
		So, the MTBF gives a statistical indication of the failure rate that can be expected during the useful life period.
		What MTTF and MTBF do not do is predict the useful life (or service life) of the product — the length of time between the end of infant mortality and the start of wear-out.
		Similar calculations can be used to show that an MTBF of 500,000 hours (approximately 57 years) gives a 95 percent chance of failure-free operation for just three years.
	www.ecnmag.com /article/CA508446.html (1006 words)

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