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Q2: typically-used parameters -> default parameters 

[Imported from Trac: page FAQ, version 56]
davidsarah 2011-11-25 17:39:32 +00:00
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FAQ.md

@ -15,7 +15,7 @@ A: You know how with RAID-5 you can lose any one drive and still recover? And t
This uses an amount of space on each server equal to the total size of your data divided by `K`.
Tahoe-LAFS is typically used with `3-of-10` parameters, so the data is spread over 10 different drives, and you can lose any 7 of them and still recover the entire data. This gives much better reliability than comparable RAID setups, at a cost of only 3.3 times the storage space that a single copy takes. It takes about 3.3 times the storage space, because it uses space on each server needs equal to 1/3 of the size of the data and there are 10 servers.
The default Tahoe-LAFS parameters are `3-of-10`, so the data is spread over 10 different drives, and you can lose any 7 of them and still recover the entire data. This gives much better reliability than comparable RAID setups, at a cost of only 3.3 times the storage space that a single copy takes. It takes about 3.3 times the storage space, because it uses space on each server needs equal to 1/3 of the size of the data and there are 10 servers.
Erasure coding is also known as "forward error correction" and as an "information dispersal algorithm".