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Updated Erasure Coding for warm storage (markdown)

Chris Lu 2019-06-10 21:46:46 -07:00
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Erasure-Coding-for-warm-storage.md

@ -7,7 +7,7 @@ Warm data are accessed less frequently. To store them more efficiently, you can
* Efficient memory usage and faster startup time. The volume server does not load index data into memory. * Efficient memory usage and faster startup time. The volume server does not load index data into memory.
* Rack-Aware data placement to minimize impact of volume server and rack failures. * Rack-Aware data placement to minimize impact of volume server and rack failures.
* No requirement for large amount of servers. SeaweedFS manage erasure coding data via volumes. If the number of servers is less than 4, this can protect against hard drive failures. If the number of servers is greater than 4, this can protect against server failures. If the number of racks is greater than 4, this can protect against rack failures. * No requirement for large amount of servers. SeaweedFS manage erasure coding data via volumes. If the number of servers is less than 4, this can protect against hard drive failures. If the number of servers is greater than 4, this can protect against server failures. If the number of racks is greater than 4, this can protect against rack failures.
* Optimized for small files: there are no file size requirement for EC to take effect. * Optimized for small files: there are no file size requirement for EC to be effective.
## How to enable it? ## How to enable it?
Run `weed scaffold -conf=master` to generate a `master.toml` file, put it in current directory, `~/.seaweedfs/`, or `/etc/seaweedfs/`. Run `weed scaffold -conf=master` to generate a `master.toml` file, put it in current directory, `~/.seaweedfs/`, or `/etc/seaweedfs/`.