Tag Archives: reliability

FMECA with Wireshark

Returning from Sharkfest, I found that my laptop’s configuration must have changed. The laptop, running Windows 7 home version, was now not able to see a few of the non-windows machines on my network, including the NAS. Assuming the cause … Continue reading

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Network availability and performability modeling tricks

I read a lot, and I mean a lot, of network reliability, availability, and performability papers. The ones we publish in the IEEE Transactions on Reliability, I read multiple times. So there are a lot of relationships that go unnoticed, … Continue reading

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Otherwise coherent networks become incoherent when capacity is concerned

See the network in Figure 1 below. Source node 1 fails, which from a pure availability perspective disrupts only traffic originating or terminating at node 1 because all other nodes can still communicate. So a coherent network (as is the … Continue reading

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Sorting through the nines to compare reliability or availability in designs

When comparing architectures for availability and reliability, it is often difficult to comprehend the small differences in the estimates. It is tempting to compare in terms of downtime, but doing that is a slippery slope; people like to think of … Continue reading

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Reliability drives innovation

The real engine behind technology advancement is reliability. Innovators would benefit from focusing on reliability. Sure we always strive to do better for various reasons: competition, market share, profit, save lives. If necessity is the mother of invention, perhaps laziness … Continue reading

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QBQ! and engineering

Engineers who solve problems (which had better be all of us!) can benefit from the concept of QBQ! create by John G. Miller (www.qbq.com). A common tool for solving engineering and business problems is root cause analysis. More specifically in … Continue reading

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