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Reword the dedup limitation for Edon-R

The old wording was effectively "You can not use this (except you can)",
which just seems confusing.

Signed-off-by: Richard Laager <>
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rlaager committed Apr 15, 2019
1 parent a83393f commit 87a42be731367d5e78a917814472b44f51a96351
Showing with 2 additions and 2 deletions.
  1. +2 −2 man/man5/zpool-features.5
@@ -652,8 +652,8 @@ DEPENDENCIES extensible_dataset
This feature enables the use of the Edon-R hash algorithm for checksum,
including for nopwrite (if compression is also enabled, an overwrite of
a block whose checksum matches the data being written will be ignored).
In an abundance of caution, Edon-R can not be used with dedup
(without verification).
In an abundance of caution, Edon-R requires verification when used with
dedup: \fBzfs set dedup=edonr,verify\fR. See \fBzfs\fR(8).

Edon-R is a very high-performance hash algorithm that was part
of the NIST SHA-3 competition. It provides extremely high hash

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