man: Improve zonemode=zbd information

Clarify the use of the zonerange and zonesize options for zonemode=zbd.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fio.1 b/fio.1
index d7421eee6267b1877e557b0a6afc7979e481b5b0..c00579bc4a1839f9c63126bdb29d9a382cb4e3a8 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -753,7 +753,10 @@ restricted to a single zone.
 .RE
 .TP
 .BI zonerange \fR=\fPint
-Size of a single zone. See also \fBzonesize\fR and \fBzoneskip\fR.
+For \fBzonemode\fR=strided, this is the size of a single zone. See also
+\fBzonesize\fR and \fBzoneskip\fR.
+
+For \fBzonemode\fR=zbd, this parameter is ignored.
 .TP
 .BI zonesize \fR=\fPint
 For \fBzonemode\fR=strided, this is the number of bytes to transfer before
@@ -762,8 +765,11 @@ skipping \fBzoneskip\fR bytes. If this parameter is smaller than
 will be accessed.  If this parameter is larger than \fBzonerange\fR then each
 zone will be accessed multiple times before skipping to the next zone.
 
-For \fBzonemode\fR=zbd, this is the size of a single zone. The \fBzonerange\fR
-parameter is ignored in this mode.
+For \fBzonemode\fR=zbd, this is the size of a single zone. The
+\fBzonerange\fR parameter is ignored in this mode. For a job accessing a
+zoned block device, the specified \fBzonesize\fR must be 0 or equal to the
+device zone size. For a regular block device or file, the specified
+\fBzonesize\fR must be at least 512B.
 .TP
 .BI zoneskip \fR=\fPint
 For \fBzonemode\fR=strided, the number of bytes to skip after \fBzonesize\fR