config: move some config setting into commented part

It's better to set most of option as 'commented' with some
documented defaults instead of providing strict values.

This has the advantage we can eventually 'change' defualts
and get them working in future. Otherwise once the setting
is stored in lvm.conf in /etc, such setting has strictly
defined value and that can be only change with file update.

1 files changed, 34 insertions, 17 deletions

diff --git a/conf/example.conf.in b/conf/example.conf.in
index a3d8ca380..6b0622ab9 100644
--- a/conf/example.conf.in
+++ b/conf/example.conf.in
@@ -429,7 +429,8 @@ allocation {
 
 	# Configuration option allocation/cache_pool_metadata_require_separate_pvs.
 	# Cache pool metadata and data will always use different PVs.
-	cache_pool_metadata_require_separate_pvs = 0
+	# This configuration option has an automatic default value.
+	# cache_pool_metadata_require_separate_pvs = 0
 
 	# Configuration option allocation/cache_metadata_format.
 	# Sets default metadata format for new cache.
@@ -489,7 +490,8 @@ allocation {
 
 	# Configuration option allocation/thin_pool_metadata_require_separate_pvs.
 	# Thin pool metadata and data will always use different PVs.
-	thin_pool_metadata_require_separate_pvs = 0
+	# This configuration option has an automatic default value.
+	# thin_pool_metadata_require_separate_pvs = 0
 
 	# Configuration option allocation/thin_pool_zero.
 	# Thin pool data chunks are zeroed before they are first used.
@@ -528,7 +530,8 @@ allocation {
 
 	# Configuration option allocation/zero_metadata.
 	# Zero whole metadata area before use with thin or cache pool.
-	zero_metadata = 1
+	# This configuration option has an automatic default value.
+	# zero_metadata = 1
 
 	# Configuration option allocation/thin_pool_chunk_size.
 	# The minimal chunk size in KiB for thin pool volumes.
@@ -990,7 +993,8 @@ global {
 	# logs and conversion to disk/core works.
 	# 
 	# Not supported for regular operation!
-	support_mirrored_mirror_log = 0
+	# This configuration option has an automatic default value.
+	# support_mirrored_mirror_log = 0
 
 	# Configuration option global/raid10_segtype_default.
 	# The segment type used by the -i -m combination.
@@ -1048,7 +1052,8 @@ global {
 	# activated from these events (the default is all.)
 	# When event_activation is disabled, the system will generally run
 	# a direct activation command to activate LVs in complete VGs.
-	event_activation = 1
+	# This configuration option has an automatic default value.
+	# event_activation = 1
 
 	# Configuration option global/use_aio.
 	# Use async I/O when reading and writing devices.
@@ -1292,7 +1297,8 @@ activation {
 	# This enables additional checks (and if necessary, repairs) on entries
 	# in the device directory after udev has completed processing its
 	# events. Useful for diagnosing problems with LVM/udev interactions.
-	verify_udev_operations = 0
+	# This configuration option has an automatic default value.
+	# verify_udev_operations = 0
 
 	# Configuration option activation/retry_deactivation.
 	# Retry failed LV deactivation.
@@ -1317,23 +1323,27 @@ activation {
 	# When disabled, the striped target is used. The linear target is an
 	# optimised version of the striped target that only handles a single
 	# stripe.
-	use_linear_target = 1
+	# This configuration option has an automatic default value.
+	# use_linear_target = 1
 
 	# Configuration option activation/reserved_stack.
 	# Stack size in KiB to reserve for use while devices are suspended.
 	# Insufficent reserve risks I/O deadlock during device suspension.
-	reserved_stack = 64
+	# This configuration option has an automatic default value.
+	# reserved_stack = 64
 
 	# Configuration option activation/reserved_memory.
 	# Memory size in KiB to reserve for use while devices are suspended.
 	# Insufficent reserve risks I/O deadlock during device suspension.
-	reserved_memory = 8192
+	# This configuration option has an automatic default value.
+	# reserved_memory = 8192
 
 	# Configuration option activation/process_priority.
 	# Nice value used while devices are suspended.
 	# Use a high priority so that LVs are suspended
 	# for the shortest possible time.
-	process_priority = -18
+	# This configuration option has an automatic default value.
+	# process_priority = -18
 
 	# Configuration option activation/volume_list.
 	# Only LVs selected by this list are activated.
@@ -1450,7 +1460,8 @@ activation {
 	#   auto
 	#     Use default value chosen by kernel.
 	# 
-	readahead = "auto"
+	# This configuration option has an automatic default value.
+	# readahead = "auto"
 
 	# Configuration option activation/raid_fault_policy.
 	# Defines how a device failure in a RAID LV is handled.
@@ -1586,7 +1597,8 @@ activation {
 	# 8.4G, it is extended to 14.4G:
 	# vdo_pool_autoextend_threshold = 70
 	# 
-	vdo_pool_autoextend_threshold = 100
+	# This configuration option has an automatic default value.
+	# vdo_pool_autoextend_threshold = 100
 
 	# Configuration option activation/vdo_pool_autoextend_percent.
 	# Auto-extending a VDO pool adds this percent extra space.
@@ -1622,7 +1634,8 @@ activation {
 	# Use the old behavior of mlockall to pin all memory.
 	# Prior to version 2.02.62, LVM used mlockall() to pin the whole
 	# process's memory while activating devices.
-	use_mlockall = 0
+	# This configuration option has an automatic default value.
+	# use_mlockall = 0
 
 	# Configuration option activation/monitoring.
 	# Monitor LVs that are activated.
@@ -1637,7 +1650,8 @@ activation {
 	# intervals of this number of seconds. If this is set to 0 and there
 	# is only one thing to wait for, there are no progress reports, but
 	# the process is awoken immediately once the operation is complete.
-	polling_interval = 15
+	# This configuration option has an automatic default value.
+	# polling_interval = 15
 
 	# Configuration option activation/auto_set_activation_skip.
 	# Set the activation skip flag on new thin snapshot LVs.
@@ -2193,7 +2207,8 @@ dmeventd {
 	# failures. It removes failed devices from a volume group and
 	# reconfigures a mirror as necessary. If no mirror library is
 	# provided, mirrors are not monitored through dmeventd.
-	mirror_library = "libdevmapper-event-lvm2mirror.so"
+	# This configuration option has an automatic default value.
+	# mirror_library = "libdevmapper-event-lvm2mirror.so"
 
 	# Configuration option dmeventd/raid_library.
 	# This configuration option has an automatic default value.
@@ -2204,14 +2219,16 @@ dmeventd {
 	# libdevmapper-event-lvm2snapshot.so monitors the filling of snapshots
 	# and emits a warning through syslog when the usage exceeds 80%. The
 	# warning is repeated when 85%, 90% and 95% of the snapshot is filled.
-	snapshot_library = "libdevmapper-event-lvm2snapshot.so"
+	# This configuration option has an automatic default value.
+	# snapshot_library = "libdevmapper-event-lvm2snapshot.so"
 
 	# Configuration option dmeventd/thin_library.
 	# The library dmeventd uses when monitoring a thin device.
 	# libdevmapper-event-lvm2thin.so monitors the filling of a pool
 	# and emits a warning through syslog when the usage exceeds 80%. The
 	# warning is repeated when 85%, 90% and 95% of the pool is filled.
-	thin_library = "libdevmapper-event-lvm2thin.so"
+	# This configuration option has an automatic default value.
+	# thin_library = "libdevmapper-event-lvm2thin.so"
 
 	# Configuration option dmeventd/thin_command.
 	# The plugin runs command with each 5% increment when thin-pool data volume