Messages in this thread | | | Date | Fri, 6 Nov 2015 21:23:38 +0000 | From | Sami Tolvanen <> | Subject | Re: [dm-devel] [PATCH 0/4] dm verity: add support for error correction |
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On Fri, Nov 06, 2015 at 10:05:24PM +0100, Zdenek Kabelac wrote: > So how do you want to correctly 'restore' missing full sectors > with just 0.8% data overhead ??
We use interleaving. Each byte in a 4k block is part of a different Reed-Solomon block, which means an entire lost 4k data block looks like a single error. When we also spread the bytes that form a single Reed-Solomon block across the partition, we end up being able to correct several megabytes of consecutive corrupted blocks with very small space overhead.
Sami
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