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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`. 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". Erasure coding is also known as "forward error correction" and as an "information dispersal algorithm".