IDAs have different security properties to erasure coding
[Imported from Trac: page FAQ, version 96]
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**<a name="Q0_what_is_it">Q0:</a> What is Tahoe-LAFS? What can you do with it?**
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**<a name="Q0_what_is_it">Q0:</a> What is Tahoe-LAFS? What can you do with it?**
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A: Think of Tahoe-LAFS as being like [BitTorrent](https://en.wikipedia.org/wiki/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.
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A: Think of Tahoe-LAFS as being like [BitTorrent](https://en.wikipedia.org/wiki/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.
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**<a name="Q1_why_tahoe_lafs">Q1:</a> What is special about Tahoe-LAFS? Why should anyone care about it instead of [other distributed storage systems](RelatedProjects#OtherProjects)?**
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**<a name="Q1_why_tahoe_lafs">Q1:</a> What is special about Tahoe-LAFS? Why should anyone care about it instead of [other distributed storage systems](RelatedProjects#OtherProjects)?**
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@ -18,9 +18,9 @@ A: You know how with RAID-5 you can lose any one drive and still recover? And t
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This uses an amount of space on each server equal to the total size of your data divided by `K`.
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This uses an amount of space on each server equal to the total size of your data divided by `K`.
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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.
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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 equal to 1/3 of the size of the data, and there are 10 servers.
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Erasure coding is also known as "forward error correction" and as an "information dispersal algorithm".
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Erasure coding is also known as "forward error correction".
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**<a name="Q3_disable_encryption">Q3:</a> Is there a way to disable the encryption for content which isn't secret? Won't that save a lot of CPU cycles?**
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**<a name="Q3_disable_encryption">Q3:</a> Is there a way to disable the encryption for content which isn't secret? Won't that save a lot of CPU cycles?**
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