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Updated Erasure coding for warm storage (markdown)

Chris Lu 2019-06-06 01:37:40 -07:00
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Erasure-coding-for-warm-storage.md

@ -31,7 +31,7 @@ With servers added or removed, some data shards may not be laid out optimally. F
The default command is `ec.balance -force`. It will try to spread the data shards evenly to minimize the data shard loss risk.
## How the read works?
When all data shards are online, the read are randomly assigned to one volume server (A) that has at least one data shard. Server A will read its copy of index file, and locate the volume server (B), and read from server B for the file.
When all data shards are online, the read for one file key are assigned to one volume server (A) that has at least one data shard for the volume. Server A will read its copy of index file, and locate the volume server (B), and read from server B for the file key.
In case of missing data shards or read failures from server B, server A will try to collect as many pieces of data as possible from the remaining servers, and compute the required data.