Changes between Version 95 and Version 96 of FAQ


Ignore:
Timestamp:
2013-07-27T02:10:23Z (11 years ago)
Author:
daira
Comment:

IDAs have different security properties to erasure coding

Legend:

Unmodified
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Modified

  • FAQ

    v95 v96  
    11'''[=#Q0_what_is_it Q0:] What is Tahoe-LAFS? What can you do with it?'''
    22
    3 A: Think of Tahoe-LAFS as being like [https://en.wikipedia.org/wiki/BitTorrent BitTorrent], except you can upload as well as download. Also, Tahoe-LAFS has directories and files so that if you're looking at a directory that is stored in Tahoe-LAFS, you can navigate to a file or sub-directory that is also in Tahoe-LAFS. So in that sense it is a little more like a filesystem than !BitTorrent is. Tahoe-LAFS comes with filesystem integration for Unix (FUSE) and for Windows—see [#Q23_FUSE Q23], below.
     3A: Think of Tahoe-LAFS as being like [https://en.wikipedia.org/wiki/BitTorrent BitTorrent], except you can upload as well as download. Also, Tahoe-LAFS has directories and files so that if you're looking at a directory that is stored in Tahoe-LAFS, you can navigate to a file or sub-directory that is also in Tahoe-LAFS. So in that sense it is a little more like a filesystem than !BitTorrent is. Tahoe-LAFS also allows filesystem integration for Unix via sshfs.
    44
    55'''[=#Q1_why_tahoe_lafs Q1:] What is special about Tahoe-LAFS? Why should anyone care about it instead of [wiki:RelatedProjects#OtherProjects other distributed storage systems]?'''
    … …  
    1919This uses an amount of space on each server equal to the total size of your data divided by {{{K}}}.
    2020
    21 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.
    22 
    23 Erasure coding is also known as "forward error correction" and as an "information dispersal algorithm".
     21The 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 equal to 1/3 of the size of the data, and there are 10 servers.
     22
     23Erasure coding is also known as "forward error correction".
    2424
    2525'''[=#Q3_disable_encryption Q3:] Is there a way to disable the encryption for content which isn't secret? Won't that save a lot of CPU cycles?'''