[tahoe-dev] Tahoe-LAFS is widely misunderstood
Greg Troxel
gdt at ir.bbn.com
Wed Feb 2 23:56:44 PST 2011
Chris Palmer <chris at noncombatant.org> writes:
> Isn't my scheme simply the most reliable and most expensive form of erasure
> coding?
No, it's *N expensive, for some factor N.
I think what Shawn is comparing is
1-of-N
k-of-k*N
An example is 1-of-4, and 10-of-40.
For 1-of-4, and 50% reliability, you have a 1/16 odds of losing.
For 10-of-40, you win if any 10 are up; my head is too foggy to do the
math but it seems lossage is much less likely than 1/16.
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