> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Sašo Kiselkov
> As your dedup
> ratio grows, so does the performance hit from dedup=verify. At, say,
> dedupratio=10.0x, on average, every write results in 10 reads.

If you intend to write a block, and you discover it has a matching checksum,
you only need to verify it matches one block.  You don't need to verify it
matches all the other blocks that have previously been verified to match
each other.

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