mean time between failures
Post on 28-Dec-2015
219 Views
Preview:
TRANSCRIPT
• Mean Time Between Failures
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
History of computing hardware - Second generation: transistors
1 Problems with the reliability of early batches of point contact and alloyed junction transistors meant that the
machine's mean time between failures was about 90 minutes, but
this improved once the more reliable bipolar junction transistors became
available.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Time-multiplexed optical shutter - General features
1 Mean time between failures: The first components it is expected to fail in a TMOS technology is the illumination system. LEDs usually have 100,000
hours MTBF under continuous operation; as TMOS uses LEDs at 1/3 duty cycle, the maximum expected
MTBF is 300,000 hours.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Time-multiplexed optical shutter - Advantages
1 Mean Time Between Failures: TMOS life could achieve 300,000 hours, overcoming the 10,000 hours of
OLED, 30,000 of plasma displays, 40,000 hours of CTRS and the
100,000 hours of LCD.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Parallel computing - Application checkpointing
1 As a computer system grows in complexity, the mean time between failures usually
decreases
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Service-level agreement
1 In this case the SLA will typically have a technical definition in terms
of mean time between failures (MTBF), mean time to repair or mean
time to recovery (MTTR); various data rates; throughput; jitter; or
similar measurable details.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Solar micro-inverter - Micro-inverters
1 Mean time between failures (MTBF) are quoted in hundreds of years.
[http://www.enphaseenergy.com/downloads/Enphase_M190_Datasheet.pdf
Enphase Microinverter M190], Enphase Energy
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Life expectancy
1 The term life expectancy may also be used in the context of manufactured
objects although the related term shelf life is used for consumer
products and the terms mean time to breakdown (MTTB) and Mean time between failures|mean time before
failures (MTBF) are used in engineering.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Parallel programming - Application checkpointing
1 As a computer system grows in complexity, the mean time between failures usually
decreases
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Ssd - Flash-based SSDs
1 These applications require the exceptional mean time between
failures (MTBF) rates that solid-state drives achieve, by virtue of their
ability to withstand extreme shock, vibration and temperature ranges.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Computer power supply - Life span
1 Life span is usually measured in mean time between failures (MTBF). Higher MTBF ratings
are preferable for longer device life and reliability. Quality construction consisting of industrial grade electrical components or a
larger or higher speed fan can help to contribute to a higher MTBF rating by keeping
critical components cool. Overheating is a major cause of PSU failure. Calculated MTBF value of 100,000 hours (about 11 years of continuous operation) is fairly common.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Maintenance, repair, and operations - MRO software
1 **Reliability data: Mean time between failures|MTBF, MTTB (mean
time to breakdown), MTBR (mean time between removals),
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Glossary of fuel cell terms - Mean time between failures
1 : Mean time between failures (MTBF) is the mean (average) time between
failures of a system, and is often attributed to the useful life of the device i.e. not including 'infant
mortality' or 'end of life' if the device is not repairable.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Service life
1 Service life is different from a predicted life, or MTBF|MTTF/MTBF (Mean Time to Failure/Mean Time
Between Failures)/Maintenance-free operating period|MFOP
(maintenance-free operating period)
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Service-level agreement
1 In this case the SLA will typically have a technical definition in terms
of MTBF|mean time between failures (MTBF), mean time to repair or mean
time to recovery (MTTR); various data rates; throughput; jitter; or
similar measurable details.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Pump - Pump repairs
1 Examining pump repair records and MTBF (mean time between failures) is of great importance to responsible
and conscientious pump users
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Ring laser gyroscope - Description
1 Many tens of thousands of RLGs are operating in inertial navigation
systems and have established high accuracy, with better than 0.01°/hour
bias uncertainty, and mean time between failures in excess of 60,000
hours.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Functional safety - Achieving Functional Safety
1 4. Verification that the system meets the assigned SIL, Automotive Safety Integrity Level|ASIL, PL or agPL by determining the Mean Time Between Failures and the Safe Failure Fraction (SFF), along with appropriate tests. The Safe
Failure Fraction is the probability of the system failing in a safe state: the dangerous (or critical) state states are identified from a Failure Mode and Effects Analysis or (Failure Mode, Effects,
and Criticality Analysis) of the system (FMEA or FMECA).
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Fault-tolerant system - Examples
1 Hardware fault-tolerance sometimes requires that broken parts can be taken out and
replaced with new parts while the system is still operational (in computing known as hot swapping). Such a system implemented with
a single backup is known as 'single point tolerant', and represents the vast majority of fault-tolerant systems. In such systems the mean time between failures should be long enough for the operators to have time to fix
the broken devices (mean time to repair)
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Logistic engineering
1 Logistics engineers work with complex mathematical models that
consider elements such as mean time between failures (MTBF), mean time to failure (MTTF), mean time to
repair (MTTR), failure mode and effects analysis (FMEA), statistical
distributions, queueing theory, and a host of other considerations
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
SCADA - Operational philosophy
1 The reliability of such systems can be calculated statistically and is stated as the mean time to failure, which is
a variant of Mean Time Between Failures (MTBF)
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Monte Carlo method - Engineering
1 * In reliability engineering, one can use Monte Carlo simulation to
generate mean time between failures and mean time to repair for
components.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
High availability - System design for high availability
1 Zero downtime system design means that modeling and simulation indicates mean
time between failures significantly exceeds the period of time between planned
maintenance, upgrade events, or system lifetime. Zero downtime involves massive
redundancy, which is needed for some types of aircraft and for most kinds of
communications satellite. Global Positioning System is an example of a zero downtime
system.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Data corruption - Overview
1 Hardware and software failure are the two main causes for data loss.
Background radiation, head crashes, and Mean time between failures|
aging or wear of the storage device fall into the former category, while
software failure typically occurs due to Software bug|bugs in the code.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Commodity hardware
1 At some point, the number of discrete systems in a cluster will be greater than the mean time between failures (MTBF) for any hardware platform, no matter how reliable, so fault
tolerance must be built into the controlling software.http://www.morganclaypool.com/doi/abs/
10.2200/S00193ED1V01Y200905CAC006http://insidehpc.com/2008/06/02/google-fellow-sheds-some-light-on-infrastructure-robustness-in-face-of-failure Purchases should be optimized on cost-
per-unit-of-performance, not just absolute performance-per-CPU at any cost.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Eight dimensions of quality - Reliability
1 This dimension reflects the probability of a product malfunctioning or failing within a specified time period. Among the most common measures of reliability are the
mean time to first failure, the mean time between failures, and the failure rate per
unit time. Because these measures require a product to be in use for a specified period, they are more relevant to durable goods than to products and services that are
consumed instantly.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Failure rate
1 In practice, the mean time between failures (MTBF, 1/λ) is often reported
instead of the failure rate
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Balanced Automatics Recoil System - Direct impingement
1 These combined factors reduce service life of these parts, reliability,
and mean time between failures.Major Thomas P
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
AirPort Time Capsule - Features
1 Apple states that the Hitachi Deskstar meets or exceeds the 1 million hours mean time between
failures (MTBF) recommendation for server-grade hard
drives.[http://db.tidbits.com/article/9479 Time Capsule Ships with Support
for USB Drive Backups]
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Entry-Level Power Supply Specification - Life span
1 Life span is usually specified in mean time between failures (MTBF), where higher MTBF ratings indicate longer
device life and better reliability. Using higher quality electrical components at
less than their maximum ratings or providing better cooling can contribute to a higher MTBF rating because lower
stress and lower operating temperatures decrease component failure rates.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Mean time between failure
1 'Mean time between failures (MTBF)' is the predicted elapsed time between inherent failures of a
system during operation.Jones, James V., Integrated Logistics Support
Handbook, page 4.2 MTBF can be calculated as the arithmetic mean
(average) time between failures of a system
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Lambda - Lower-case letter λ
1 * Lambda denotes the failure rate of devices and systems in reliability
theory, and it is measured in failure events per hour. Numerically, this
lambda is also the reciprocal of the mean time between failures.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Reliability, availability and serviceability (computer hardware) - Definitions
1 Reliability can be characterized in terms of mean time between failures
(MTBF), with reliability = exp(-t/MTBF).
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
M60 machine gun - M60E2
1 This version achieved a mean time between failures of 1,669 during testing in the 1970s..
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Life Expectancy Index
1 The term that is known as life expectancy is most often used in the context of human populations, but is also used in plant or
animal ecology; life tables (also known as actuary|actuarial tables). The term life
expectancy may also be used in the context of manufactured objects, although the
related term shelf life is used for consumer products and the terms mean time to
breakdown (MTTB) and mean time between failures (MTBF) are used in engineering.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Run Book Automation - Runbook Automation
1 According to Gartner, the growth of RBA has coincided with the need for IT operations executives to enhance IT operations efficiency measures—
including reducing mean time to repair (MTTR), increasing mean time
between failures (MTBF), and automating provisioning of
Information technology|IT resources
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Manchester computers - Transistor Computer
1 Problems with the reliability of early batches of transistors meant that the
machine's mean time between failures was about 90 minutes, which
improved once the more reliable Bipolar junction transistor|junction
transistors became available
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Peltier cooler - Construction
1 * Has a long life, with mean time between failures (MTBF) exceeding 100,000 hours
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Commodity server
1 At some point, the number of discrete systems in a cluster will be greater than the mean time between failures (MTBF) for any hardware platform, no matter how reliable, so fault
tolerance must be built into the controlling software.http://www.morganclaypool.com/doi/abs/
10.2200/S00193ED1V01Y200905CAC006http://insidehpc.com/2008/06/02/google-fellow-sheds-some-light-on-infrastructure-robustness-in-face-of-failure Purchases should be optimized on cost-
per-unit-of-performance, not just absolute performance-per-CPU at any cost.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Mean time to repair
1 MTTR is often part of a maintenance contract, where a system whose
MTTR is 24 hours is generally more valuable than for one of 7 days if
mean time between failures is equal, because its Operational Availability is
higher.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Synchronizer
1 * In electronics, whenever there is signal transfer between two systems operating at
different frequencies or same frequency with different phases, synchronizer block is used
as an interface so that signal from transmitter block is reliably interpreted by the receiver. The block usually uses metastable hardened flops offering single or double latency delays at the output. This block ensures that there is no metastability for a target MTBF i.e., Mean
Time Between Failures
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Fault tolerant system - Examples
1 In such systems the mean time between failures should be long
enough for the operators to have time to fix the broken devices (mean
time to repair) before the backup also fails
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Passenger car (rail) - Kawasaki
1 Kawasaki Heavy Industries|Kawasaki has been manufacturing passenger rail cars at its
facility in Lincoln, Nebraska since 2001. Kawasaki's Lincoln plant has manufactured
rail cars for MBTA, NYCT, PATH, MNR with cars that have led the way with the industry's best
MTBF (Mean Time Between Failures). Kawasaki Rail Car was the first American rail car manufacturer to achieve the International
Organization for Standardization ISO-9002 certification.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Water pump - Pump repairs
1 Examining pump repair records and mean time between failures (MTBF) is of great importance to responsible
and conscientious pump users
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
M109 howitzer - M109 KAWEST
1 New electrical system increases reliability (better than Mil STD 1245A,
higher operational readiness, increased mean time between
failures, fault-finding diagnostics with test equipment.)
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Hard disk failure - Causes
1 HDD manufacturers typically specify a MTBF|Mean Time Between Failures or an Annualized Failure Rate (AFR) which are population statistics that can not predict the behavior of an
individual unit
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Hard disk failure - Metrics of failures
1 The mean time between failures (MTBF) of SATA drives is usually
specified to be about 1.2million hours (some drives such as Western Digital Raptor have rated 1.4million hours
MTBF), while SAS/FC drives are rated for upwards of 1.6million hours
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Charging handle
1 One issue is the mean time between failures due to metal fatigue
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Life expectancy at birth
1 Life expectancy is also used in plant or animal ecology; life tables (also known as actuary|actuarial tables).
The term life expectancy may also be used in the context of manufactured objects, although the related term
shelf life is used for consumer products and the terms mean time to
breakdown (MTTB) and mean time between failures (MTBF) are used in
engineering.https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Water turbine - Time line
1 Around 1890, the modern fluid bearing was invented, now
universally used to support heavy water turbine spindles. As of 2002,
fluid bearings appear to have a mean time between failures of more than
1300 years.
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
Direct impingement - Evaluation
1 These combined factors reduce service life of these parts, reliability,
and mean time between failures.Major Thomas P
https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
For More Information, Visit:
• https://store.theartofservice.com/the-mean-time-between-failures-toolkit.html
The Art of Servicehttps://store.theartofservice.com
top related