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According to this answer it should not be performing like this but here it is doing exactly that!

Screenshot of DDRESCUE showing performance metric

Giacomo1968
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1 Answers1

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It was BTRFS compression.

And since I was writing all zeros 3.5 TiB of zeros compressed to around 90 GiB and the actual throughput was significantly lower than I was lead to believe by the performance metrics.

Giacomo1968
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