man: expand lvchange --discard entry

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

diff --git a/man/lvchange.8.in b/man/lvchange.8.in
index c7507d47372be4d7f68d4b055b75beb36260bc1d..e58d79cebfb673ff24883378b1bdc92424b35b71 100644 (file)
--- a/man/lvchange.8.in
+++ b/man/lvchange.8.in
@@ -16,6 +16,8 @@ lvchange \- change attributes of a logical volume
 .RB [ \-d | \-\-debug ]
 .RB [ \-\-deltag
 .IR Tag ]
+.RB [ \-\-discard
+.RI { ignore | nopassdown | passdown }]
 .RB [ \-\-resync ]
 .RB [ \-h | \-? | \-\-help ]
 .RB [ \-\-ignorelockingfailure ]
@@ -37,7 +39,9 @@ lvchange \- change attributes of a logical volume
 .RI { ReadAheadSectors | auto | none }]
 .RB [ \-\-refresh ]
 .RB [ \-t | \-\-test ]
-.RB [ \-v | \-\-verbose]
+.RB [ \-v | \-\-verbose ]
+.RB [ \-Z | \-\-zero
+.RI { y | n }]
 .I LogicalVolumePath
 .RI [ LogicalVolumePath ...]
 .SH DESCRIPTION
@@ -68,6 +72,14 @@ logical volumes. It's only possible to change a non-contiguous
 logical volume's allocation policy to contiguous, if all of the
 allocated physical extents are already contiguous.
 .TP
+.BR \-\-discard " {" \fIignore | \fInopassdown | \fIpassdown }
+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
 circumstances you should not need this option because synchronization
@@ -105,6 +117,11 @@ this is equivalent to using  \fB\-\-ignorelockingfailure\fP,
 \fB\-\-ignoremonitoring\fP, \fB\-\-poll n\fP and setting
 \fBLVM_SUPPRESS_LOCKING_FAILURE_MESSAGES\fP
 environment variable.
+
+If \fB\-\-sysinit\fP is used in conjunction with lvmetad(8) enabled and running,
+autoactivation is preferred over manual activation via direct lvchange call.
+Logical volumes are autoactivated according to auto_activation_volume_list
+set in lvm.conf(5).
 .TP
 .B \-\-noudevsync
 Disable udev synchronisation. The
@@ -137,6 +154,11 @@ If the logical volume is active, reload its metadata.
 This is not necessary in normal operation, but may be useful
 if something has gone wrong or if you're doing clustering
 manually without a clustered lock manager.
+.TP
+.BR \-Z ", " \-\-zero " {" \fIy | \fIn }
+Set zeroing mode for thin pool. Note: already provisioned blocks from pool
+in non-zero mode are not cleared in unwritten parts when setting zero to
+\fIy\fP.
 .SH Examples
 Changes the permission on volume lvol1 in volume group vg00 to be read-only:
 .sp