115: Both Sides of a Mirror Have Errors
I’m working on OpenZFS Mastery’s discussion of self-healing with a completely plugged ear, so I have no idea how this sounds.
OpenZFS uses hashes almost everywhere. A hash is an algorithm that takes a chunk of data and computes a fixed-length string from it. The interesting thing about a hash is that minor changes in the original data dramatically change the data’s hash. Each block of storage includes the hash of its parent block, while each parent block includes the hash of all its immediate children. Whenever the system accesses data, it verifies the data’s correctness using these hashes…
The skinny
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