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Erasure coding error detection ability

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I would like to know in an (2+1) Erasure coding storage setup, can it detect corruption when one node is lost, and there is a silent data corruption from HDD on one of the remaining node.

I am experimenting GlusterFS dispersed volume which use erasure coding. I created a 3 node (2+1) dispersed volume (erasure coding). Put a file in it. Then I poweroff one of the node. On one of the remaining node, I use vi to modify a single character of that file in the underlying storage (bricks) of that volume. Then restore the modification timestamp of that file. Then, I use sha256sum to read that file from the volume, Gluster return Input/Output error (EIO). Is this the effect of Erasure coding, or the effect GlusterFS's metadata to detect this kind of corruption.

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