Impact of compression on scrubs #13139
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I'm trying to understand how compression is treated during a scrub. Let's say I have a dataset or zvol that's 1TB in size with a 50% compression (1.50x compressratio). Is the data first decompressed and then checked, effectively scrubbing the full 1TB of data, or is only 500GB of data scrubbed? |
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What I'm trying to understand from my question is what's the order of the operations in the chain. I ended up finding the answer: |
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Scrubs check the checksum of the data on disk, which is after compression/encryption. They aren't going to try decompressing or decrypting it. |
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What I'm trying to understand from my question is what's the order of the operations in the chain. I ended up finding the answer:
When a file is written, the data is compressed, encrypted, and the checksum is verified. Then, the data is deduplicated, if possible.