HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Ivan Kirkpatrick
User Rank
Platinum
Definitely a trend to watch
Ivan Kirkpatrick   10/3/2011 10:00:20 AM
NO RATINGS
I can see a lot of advantages in multicore processors like these.  I wonder though about the fault tolerance for a device that uses two cores and compares the results?  I would think 3 cores and voting the odd one out might be slightly more expensive but better.  Along those same lines the fault tolerance and ability to function in a degraded state might be really useful as well.  Sensor failure or errors related to the sensors need to be accommodated as well in a fault tolerant manner.

I am a bit leary of simply adding in more redundancy.  That can also lead to more failures.  Correct me if I am wrong but 2 controllers with 99% reliability each when coupled are they not then 98% reliable?

In general I learned it was better to design systems with greater reliability, test it and prove it historically in production.  Then only add additional redundancy if it was really required.  Some systems required redundancy as a matter of course in terms of availability for maintenance and mission critical applications.  Perhaps others can weigh in on this and explain this subject a little better.  

I suppose part of this is the diffference between redundant and backup components?  When I served on US Navy ships we had three steam driven turbogenerators for redundancy and a diesel generator for backup.  But we had only one main engine.  I know the costs figure into this as well as they always do.

Senerjp
User Rank
Iron
Re: Definitely a trend to watch
Senerjp   10/4/2011 10:18:46 AM
NO RATINGS
Two controllers, if they are truly ustilizing multi-pathing, would actually act in parallel and would be more reliable. R = 1-(1-R)^n so to the extent they are completely seperate ( which nothing ever truly is) they would approximate R=.9999!



Partner Zone
Latest Analysis
Kaspersky Labs indicated at its February meeting that cyber attacks are far more sophisticated than previous thought. It turns out even air-gapping (disconnecting computers from the Internet to protect against cyber intrusion) isnít a foolproof way to avoid getting hacked. And Kaspersky implied the NSA is the smartest attacker.
Counterfeit parts are an increasing problem. Eaton has launched a program to educate buyers in identifying counterfeit electronic components.
If the deal is approved, the companies would create a top-10 chip maker and embedded processor giant with more than $10 billion in combined revenue.
It's the Batsuit Gotham needs. An industrial design student's Batsuit can protect would-be vigilantes from fists, blunt objects, and knives.
Two independent purchasing managers indexes (PMI) released today (March 2), revealed conflicting pictures on the direction of the US manufacturing sector in February.
More:Blogs|News
Design News Webinar Series
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Mar 9 - 13, Implementing Motor Control Designs with MCUs and FPGAs: An Introduction and Update
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service