Reword the dedup limitation for Edon-R

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

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Laager <rlaager@wiktel.com>
Closes #8626

diff --git a/man/man5/zpool-features.5 b/man/man5/zpool-features.5
index 146cc05495b16f6c289f9335bbff342f5ca65463..a5cf7a9ede62e7c97fd16a33012ef82d20a9b825 100644 (file)
--- a/man/man5/zpool-features.5
+++ b/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