Changes between Version 55 and Version 56 of FAQ


Ignore:
Timestamp:
2011-11-25T17:39:32Z (13 years ago)
Author:
davidsarah
Comment:

Q2: typically-used parameters -> default parameters

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  • FAQ

    v55 v56  
    1616This uses an amount of space on each server equal to the total size of your data divided by {{{K}}}.
    1717
    18 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.
     18The 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.
    1919
    2020Erasure coding is also known as "forward error correction" and as an "information dispersal algorithm".