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Topic: Mean time between failure

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	MTBF -- a measure of OEM component reliability (Site not responding. Last check: 2007-11-07)
		Because MTBF is widely used by suppliers of components used in Intel/Microsoft based PC's, it is regarded throughout the industry as an effective gauge of reliability.
		MTBF is the mean of a distribution of product life times, often estimated by dividing the total operating time accumulated by a "defined group" of components within a given time period, by the total number of failures in that time period.
		This means that a group of disk drives which began with 500,000 hour MTBF ratings when Blue Max Technology received them may result in a subset of the drives which actually ship with Blue Max systems which have MTBF ratings of 1,000,000 or more hours.
	www.bluemax.net /docs/Motherboards/General_Info/mtbf.html (2635 words)

	Design life - Wikipedia, the free encyclopedia
		The design life of a component or product is the period of time during which the item is expected by its designers to work within its specified parameters; in other words, the life expectancy of the item.
		The design life of components often is denominated as a mean time between failure (MTBF), which tells the user that they may expect the average component to last for the specified time.
		Note, though, that an MTBF rating is no guarantee that any single example of the product or component will not fail before the mean time specified.
	en.wikipedia.org /wiki/Design_life (369 words)

	Software Engineering Baselines (Site not responding. Last check: 2007-11-07)
		Maintainability is often measured by Mean Time To Repair (MTTR) and availability by the ratio of the Mean Time Between Failures (MTBF) to the sum of MTBF and MTTR.
		Failure Rate (1) The ratio of the number of failures of a given category or severity to a given period of time; for example, failures per month.
		Then the expected number of failures in a time interval is proportional to the length of that time interval.
	www.dacs.dtic.mil /techs/baselines/reliability.html (2126 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.
	faq.storagereview.com /tiki-index.php?page=MTBF (362 words)

	Glossary of Reliability Engineering Terms - Relex Software
		A failure distribution similar to the Normal distribution except that the logarithm of the values of random variables, rather than the values themselves, are assumed to be normally distributed.
		MTBF is a statistical value and is meant to be the mean over a long period of time and large number of units.
		Calculation of equipment failure rate, and the related MTBF (Mean Time Between Failures), is the basis of performing a reliability prediction analysis.
	www.relex.com /resources/glossary.asp (4515 words)

	Failure rate - Psychology Central (Site not responding. Last check: 2007-11-07)
		Failure rate can also be defined mathematically as the conditional probability per unit time that a failure occurs in a specified interval, given no failure before time $t \!$ .
		Failure rates are often expressed in engineering notation as failures per million, or $10^{-6} \!$ , especially for individual components, since their failure rates are often very low.
		Under certain engineering assumptions, the failure rate for a complex system is simply the sum of the individual failure rates of its components, as long as the units are consistent, e.g.
	psychcentral.com /psypsych/Failure_rate (1770 words)

	MTBF - Mean Time Between Failure
		A 'guesstimate' of the average, or mean time between design or component failure or disruption in the operation of the product, process, procedure, or design occurs.
		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.
		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)

	Mean Time Between Failure (MTBF) Data Analysis of UPS
		MTBF by definition is the total running hours divided by the number of failures.
		Solidstate Controls believes that the MTBF for each major UPS section should be stated independently and should be based on actual field data rather than the theoretical calculations described in the military standard, MIL-217F, which is often the basis for published MTBF numbers.
		The MTBF for the ferroresonant inverters is particularly noteworthy since it is 2-3 times higher than inverters using pulse-width or step-wave technology.
	www.solidstatecontrolsinc.com /techhpapers/papers/mtbf.html (507 words)

	Estimating Disk Failure Rates.
		MTBF is the mean of a distribution of product life times, often estimated by dividing the total operating time accumulated by a ``defined group'' of drives within a given time period, by the total number of failures in that time period.
		The low MTBF value is most likely due to a number of ``real life'' variables such as the recent power problems, and the use of the drives in fileservers, which increases the seek rate reducing manufacturer MTBF.
		At this time, we have less then 5% of AFS space in reserve, and half of this is in small, miscellaneous partitions that would not allow a full restore of any lost partitions.
	www.rpi.edu /AFS/home/89/sofkam/public_html/fileserverdisks.html (1468 words)

	IT Management: Columns (Site not responding. Last check: 2007-11-07)
		Mean Time Between Failure (MTBF) is a much-used management metric in IT both for discrete components as well as overall systems.
		Where MTBF breaks down is when management puts too much faith in unproven MTBF estimates and uses them to justify inordinately massive amounts of capital investment on complex systems.
		In it he observed that system accidents can be the result of one big failure, but most often are caused by the unexpected interactions between failures of multiple components.
	itmanagement.earthweb.com /columns/print.php/3354191 (734 words)

	Section3.6
		The mean time between failure and the availability of the basic ASOS sensor group for selected sites was graphed for the period of February 1, 1997 through April 30.
		The objective of this process was to determine whether the mean time between failure and availability of the sensors was comparable with the levels produced in the ASOS Aviation Demonstration Final Report dated February 1996.
		The mean sensor missing time indicated an overall decrease in sensor missing time throughout the sampling with an average decrease of outage time of 1.37 hours.
	www.faa.gov /ATS/ars/Directorates/Arw/Section3-6.htm (606 words)

	MTBF - Mean Time Before Failure, MTTF, MTBCF Mean Time Between Critical Failure
		"Mean time before failure" is a reliability calculation, often referred to as Mean Time To Failure, or MTTF.
		Relex Markov software from the Relex analysis tools can be applied to a wide variety of engineering applications where mean time before failure is changing with system states.
		For mean time before failure and mean time between critical failure calculations, trust Relex Software for an unprecedented level of power and flexibility for your analyses with the newest reliability standards.
	www.relexsoftware.com /resources/mtbf-mttf.asp (223 words)

	Mean Time Between Failure
		M.T.B.F. is an acronym for Mean Time Between Failure and is often seen in product specifications for hard disk drives.
		With hundreds of thousands of hours between failures it is easy to become assured that your hard disk will not fail in ten years or longer and that your data is safe.
		This often causes the drive head to physically hit and damage the drives data surfaces because the normal distance between these items is microscopic.
	www.rjdunn.co.uk /MTBF.htm (465 words)

	Informance International - Knowledge Center (Site not responding. Last check: 2007-11-07)
		Cycle Time Analysis starts by analyzing production trends and thus focuses on the time when a machine is actually producing parts.
		Mean Time Between Failure (MTBF) is the average time between downtime event occurrences and is used to determine the Preventive/Predictive Maintenance (PM) interval.
		Cycle Time Erosion is the amount of lost time (or output) because of the variation observed from the cycle time analysis.
	www.factoryware.com /?action=article&ID=56 (602 words)

	How old is that server anyway?
		Mean Time Between Failure is the statistical mean time a component is expected to work without failing.
		The MTBF rating can be used to determine the percentage chance a given piece of equipment will fail.
		For the mathematically included among you, MTBF is applied to a group of equipment to help determine the quantity that will fail.
	www.dynamicnet.net /news/articles/how_old_is_that_server.htm (868 words)

	The Mean Life Function
		The mean life function, which provides a measure of the average time of operation to failure, is given by:
		It should be noted that this is the expected or average time-to-failure and is denoted as the MTBF (Mean-Time-Before Failure) and is also called MTTF (Mean-Time-To-Failure) by many authors.
		For the mean life function, the only time that the Mean-Time-Between-Failure translation is correct is when the underlying distribution has a constant failure rate (e.g.
	www.weibull.com /LifeDataWeb/the_mean_life_function.htm (107 words)

	Measuring your Domino server's reliability (Site not responding. Last check: 2007-11-07)
		MTBF uses the startup, shutdown, and crash entries to generate a variety of server statistics, such as the total server uptime for the week, or the server's mean time between failures.
		MTBF became an integral part in determining the final release dates of Domino and Notes.
		We recommend you choose a time when the server load is low, such as early morning, since this operation is fairly intensive.
	www-128.ibm.com /developerworks/lotus/library/ls-Measuring_reliability (4031 words)

	Mean Time Between Failure: Explanation and Standards from American Power Conversion White Papers at ZDNet UK (Site not responding. Last check: 2007-11-07)
		Mean Time Between Failure: Explanation and Standards from American Power Conversion White Papers at ZDNet UK Don't Miss:
		Mean Time Between Failure is a reliability term used loosely throughout many industries and has become widely abused in some.
		MTBF is largely based on assumptions and definition of failure and attention to these details are paramount to proper interpretation.
	whitepapers.zdnet.co.uk /0,39025945,60137969p,00.htm (136 words)

	MITRE - Our Work - Technical Papers - Annual Best Papers - 2002 Best Papers - Approximation of Mean Time Between ...
		This paper describes a simple technique for estimating the mean time between failure (MTBF) of a system that has periodic maintenance at regular intervals.
		The motivation for this analysis was to understand the nature of the error in the approximation and to develop a means for quantifying that error.
		It shows that, for most applications, the MTBF calculations can be greatly simplified with only a very small sacrifice in accuracy.
	www.mitre.org /work/best_papers/best_papers_02/mondro_approx (322 words)

	MTBF (Mean time between failure) (Site not responding. Last check: 2007-11-07)
		I've seen MTBF's ranging up to 20,000 years on "Critical Mission" controllers, where common failures were not considered by the manufacturer at his calculations, and yet they were so obvious at a first look at the equipment.
		However, the reason why MTBF of an individual component in and of itself is important is for maintenance planning (i.e., how many spares do I need or how much time should I plan for a technician to be spending on this subsystem).
		The "At-Risk" Time is the sum of all the elapsed calendar time for all units.
	www.control.com /control_com/953591887/index_html (2772 words)

	Glossary of Terms
		The AGP main memory use is dynamic, meaning that when not being used for accelerated graphics, main memory is restored for use by the operating system or other applications.
		PCI transmits 32 bits at a time in a 124-pin connection (the extra pins are for power supply and grounding) and 64 bits in a 188-pin connection in an expanded implementation.
		This means the maximum amount of data exchanged between the processor and peripherals using PCI-X 2.0 is 2.08 GB and 4.16 GB per second.
	www.ami.com /support/glossary.cfm (13219 words)

	Welcome to the Mobile Data Association (Site not responding. Last check: 2007-11-07)
		Generally, the time taken from talking to the pager bureau to the receiver actually alerting the customer is less than 15 seconds.
		Pagers are very small devices that are worn on the belt and often have vibrators to alert the customer that a message has been received.
		This means that groups of two to thousands of pagers can be alerted with only one paging call.
	www.mda-mobiledata.org /mda/resource/paging.asp (953 words)

	Robot encyclopaedia (Site not responding. Last check: 2007-11-07)
		These are small aerial robots measuring 6" x 6" or smaller and weighing less than 4 ounces.
		For example, given the starting and final locations of a robot mechanism, the intermediate setpoints are calculated by the motion engine.
		This is typically calculated by dividing the number of hours in service by a given population of robots by the number of failures.
	www.trueforce.com /encyclopaedia/robot_encyclopaedia-M.htm (407 words)

	A Flow Measurement Orientation
		Von Karman published his findings in 1954, and because by that time the sensors and electronics required to count vortices were already in existence, the first edition of the Instrument Engineers' Handbook in 1968 was able to report the availability of the first swirlmeter.
		It is now possible to replace dye-tagging or chemical-tracing meters (which measured flow velocity by dividing the distance between two points by the transit time of the trace), with traceless cross-correlation flowmeters (Figure 1-6).
		Therefore, time should be invested in fully evaluating the nature of the process fluid and of the overall installation.
	www.tcomega.com /literature/transactions/volume4/T9904-06-FLOW.html (3246 words)

	SwRI: Failure and construction analysis of electronic and electrical components since 1978. (Site not responding. Last check: 2007-11-07)
		Failure analysis and construction analysis of electronic and electrical components have been the primary emphases of the Southwest Research Institute (SwRI) Component-Analysis Group since 1978.
		Future failures were avoided with more careful probing techniques.
		Please e-mail Stan Silvus or call 210-522-2742 to discuss electronic and electrical component analysis, including failure analysis, or how to contract with SwRI for electronic and electrical component analysis.
	www.swri.org /4org/d14/elecpow/eleccomp (198 words)

	Planning for High Availability: Attempt to Eliminate Downtime
		To ensure that systems are available for requests when called upon, you have to plan for the failure of those same resources that are being requested.
		Taking the time to plan and design is the key to maximizing the possibility of a successful deployment.
		Remember, high availability assures uptime, uptime may be your business so you should consider the costs of implementing a highly available solution, one failure that causes your series downtime may be all it takes to have paid for the solution in the first place.
	www.windowsnetworking.com /articles_tutorials/High-Availability-Eliminate-Downtime.html (3047 words)

	Mean Time Between Failure (Site not responding. Last check: 2007-11-07)
		The MTBF (Mean Time Between Failures) is obtained from industry standards and then adjusted for marine practices.
		It is of utmost importance to note that these models are dynamic and the variables are constantly in flux due to a variety of exogenous factors.
		For example you might want to use MTBCF (Mean Time Between Critical Failures).
	www.msc.navy.mil /n7/lcm/LCIN009.htm (314 words)

	Mean Time Between Failures (Site not responding. Last check: 2007-11-07)
		Those who attended the Life Cycle Engineering Course March 2003, and who diligently read the Life Cycle Newsletter, will no doubt recollect that Mean Time Between Failures (MTBF) is the cornerstone of a proactive Maintenance Excellence Program.
		MTBF is very important, is easy to calculate, and you don't need a CMMS to track it (but it would help).
		Next, divide the number of emergency work orders in time and this calculates Mean Time Between Failure (MTBF).
	www.msc.navy.mil /n7/lcm/LCIN012.htm (453 words)

	Understanding 'Mean Time Between Failure'
		Until the day comes when quiet PCs are the norm, a few add-ons can give you a bit of peace without breaking the bank.
		This paper discusses recovery to virtual computer environments, hardware migration strategies, hardware repurposing for optimal resource utilization, meeting recovery time objectives, and increasing disaster tolerance.
		Webcast: The True Value of Change Management--Learn the benefits of change management, why trying to eliminate all risk can be counter-productive, and the best way to handle emergency changes.
	itmanagement.earthweb.com /columns/article.php/3354191 (1117 words)

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