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* Change some absolute URLs to internal links * Fix some bulletted list indentation * Choose a better lexer for some syntax highlighting * Use ``inline code`` instead of `italics` for some example command lines * Change some quoted paragraphs that only included inlined code to be proper code blocks Change-Id: Iaaa7eefb690122f5af9dcb1c871358c22335c743
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Erasure coding
Erasure coding is a set of algorithms that allows the reconstruction
of missing data from a set of original data. In theory, erasure coding
uses less capacity with similar durability characteristics as replicas.
From an application perspective, erasure coding support is transparent.
Object Storage (swift) implements erasure coding as a Storage Policy.
See /overview_policies
for more details.
There is no external API related to erasure coding. Create a container using a Storage Policy; the interaction with the cluster is the same as any other durability policy. Because support implements as a Storage Policy, you can isolate all storage devices that associate with your cluster's erasure coding capability. It is entirely possible to share devices between storage policies, but for erasure coding it may make more sense to use not only separate devices but possibly even entire nodes dedicated for erasure coding.
Important
The erasure code support in Object Storage is considered beta in
Kilo. Most major functionality is included, but it has not been tested
or validated at large scale. This feature relies on ssync
for durability. We recommend deployers do extensive testing and not
deploy production data using an erasure code storage policy. If any bugs
are found during testing, please report them to https://bugs.launchpad.net/swift