man: expand lvchange --discard entry

[lvm2.git] / man / lvchange.8.in

diff --git a/man/lvchange.8.in b/man/lvchange.8.in
index beb77a86bc09947329fe9a3cc90884dbfd162a28..e58d79cebfb673ff24883378b1bdc92424b35b71 100644 (file)
--- a/man/lvchange.8.in
+++ b/man/lvchange.8.in
@@ -73,7 +73,12 @@ logical volume's allocation policy to contiguous, if all of the
 allocated physical extents are already contiguous.
 .TP
 .BR \-\-discard " {" \fIignore | \fInopassdown | \fIpassdown }
-Change discard behavior.
+Set this to \fIignore\fP to ignore any discards received by a
+thin pool Logical Volume.  Set to \fInopassdown\fP to process such
+discards within the thin pool itself and allow the no-longer-needed
+extents to be overwritten by new data.  Set to \fIpassdown\fP to
+process them both within the thin pool itself and to pass them down
+the underlying device.
 .TP
 .B \-\-resync
 Forces the complete resynchronization of a mirror.  In normal