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Updated Erasure Coding for warm storage (markdown)

Chris Lu 2019-06-11 10:26:08 -07:00
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Erasure-Coding-for-warm-storage.md

@ -38,6 +38,8 @@ The scripts have 3 steps related to erasure coding.
The default command is `ec.encode -fullPercent=95 -quietFor=1h`. It will find volumes at least 95% of the maximum volume size, which is usually 30GB, and have no updates for 1 hour. The default command is `ec.encode -fullPercent=95 -quietFor=1h`. It will find volumes at least 95% of the maximum volume size, which is usually 30GB, and have no updates for 1 hour.
Note: One collection can contain both normal volumes and erasure coded volumes, with write requests going to normal volumes.
### Data Repair ### Data Repair
If disks fail or servers fail, some data shards are lost. With erasure coding, we can recover the lost data shards from the remaining data shards. If disks fail or servers fail, some data shards are lost. With erasure coding, we can recover the lost data shards from the remaining data shards.