Hi,
David Barrett <[EMAIL PROTECTED]> writes:
> For example, I buy the mathematical argument that FEC across 8
> strangers' machines is more reliable than whole-file replication
> across 4 buddies.
It's actually not that simple. Please do read [0] and [1]. Roughly,
whether erasure coding improves data *availability* over simple
replication (which is what we care about in a backup system) depends on
a number of factors, notably individual peer availability.
That is, if you pick up untrusted backup buddies at random on the
Internet, it may be the case that you'd be better off using simple
replication than erasure coding for a given storage overhead (from an
availability viewpoint).
This is often overlooked it seems.
Thanks,
Ludovic.
[0] W. Lin et al., "Erasure Code Replication Revisited",
http://femto.org/p2p2004/papers/lin.pdf
[1] Antoine Vernois et al., "Data Durability in Peer to Peer Storage
Systems", http://graal.ens-lyon.fr/~avernois/IMG/pdf/gp2pc04.pdf
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