man: clarify lvcreate size in extents

diff --git a/man/lvcreate.8.in b/man/lvcreate.8.in
index 3e2bf32814689bfb26a453fcd73eb5440e09e19e..da308fab373249ee80971592620f2811386f8fbc 100644 (file)
--- a/man/lvcreate.8.in
+++ b/man/lvcreate.8.in
@@ -329,19 +329,18 @@ is specified.
 .IR LogicalExtentsNumber \c
 .RB [ % { VG | PVS | FREE | ORIGIN }]
 .br
-Gives the number of logical extents to allocate for the new
-logical volume.  The total number of physical extents allocated will be
-greater than this, for example, if the volume is mirrored.
-The number can also be expressed as a percentage of the total space
-in the Volume Group with the suffix \fB%VG\fP, as a percentage of the
-remaining free space in the Volume Group with the suffix \fB%FREE\fP, as a
-percentage of the remaining free space for the specified
+The size of the new LV in logical extents.  The number of physical extents
+allocated may be different, and depends on the LV type, e.g.  mirroring.
+The number of logical extents can also be expressed as a percentage of the
+total space in the Volume Group with the suffix \fB%VG\fP, as a percentage
+of the remaining free space in the Volume Group with the suffix
+\fB%FREE\fP, as a percentage of the remaining free space for the specified
 PhysicalVolume(s) with the suffix \fB%PVS\fP, or (for a snapshot) as a
-percentage of the total space in the Origin Logical Volume with the
-suffix \fB%ORIGIN\fP (i.e. \fB100%ORIGIN\fP provides space for the whole origin).
-When expressed as a percentage, the number is treated
-as an approximate upper limit for the number of physical extents
-to be allocated (including extents used by any mirrors, for example).
+percentage of the total space in the Origin Logical Volume with the suffix
+\fB%ORIGIN\fP (i.e. \fB100%ORIGIN\fP provides space for the whole origin).
+When expressed as a percentage, the number is treated as an approximate
+upper limit, and the actual size of the LV (in logical extents) may be
+less.
 .
 .HP
 .BR \-j | \-\-major