[tahoe-dev] Kragen Sitaker, Brian Warner, Josh Wilcox, Bram Cohen, Russ Roberts, and Nassim Taleb on erasure coding probabilities
zooko at zooko.com
Sat Sep 29 17:39:25 UTC 2007
On Sep 26, 2007, at 2:00 PM, Arno Waschk wrote:
> is it possible that Bram means something like "<0.95 means that human
> beings are using the power switch, so you would (a) need to analyze
> psychotics and (b) might see correlated failures when many people are
> switching off during the same baseball event?"
That's a good theory. I think that's a good way to categorize nodes
We can separately analyze "availability" -- whether the file is
available right when you want it -- from "reliability" -- whether the
file will become available eventually.
For example, suppose you have a friendnet for sharing backup space.
The availability of nodes might be low -- especially if the friends
don't have always-on computer and always-on internet connections.
But the reliability ought to be pretty high -- your friends won't
delete your data unless there is some kind of accident such as a
mistake on their part or a hard drive crash.
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