NAME
lvm.conf — Configuration file for LVM2
SYNOPSIS
/etc/lvm/lvm.conf
DESCRIPTION
lvm.conf is loaded during the initialisation phase of lvm(8). This file can in turn lead to other files being loaded - settings read in later override earlier settings. File timestamps are checked between commands and if any have changed, all the files are reloaded.
For a description of each lvm.conf(5) setting, run:
lvmconfig --typeconfig default --withcomments --withspaces
The settings
defined in lvm.conf can be overridden by any of these
extended configuration methods:
direct config override on command line
The --config ConfigurationString command line option takes the ConfigurationString as direct string representation of the configuration to override the existing configuration. The ConfigurationString is of exactly the same format as used in any LVM configuration file.
profile config
A profile is a set of selected customizable configuration settings that are aimed to achieve a certain characteristics in various environments or uses. It’s used to override existing configuration. Normally, the name of the profile should reflect that environment or use.
There are two groups of profiles recognised: command profiles and metadata profiles.
The command profile is used to override selected configuration settings at global LVM command level - it is applied at the very beginning of LVM command execution and it is used throughout the whole time of LVM command execution. The command profile is applied by using the --commandprofile ProfileName command line option that is recognised by all LVM2 commands.
The metadata profile is used to override selected configuration settings at Volume Group/Logical Volume level - it is applied independently for each Volume Group/Logical Volume that is being processed. As such, each Volume Group/Logical Volume can store the profile name used in its metadata so next time the Volume Group/Logical Volume is processed, the profile is applied automatically. If Volume Group and any of its Logical Volumes have different profiles defined, the profile defined for the Logical Volume is preferred. The metadata profile can be attached/detached by using the lvchange and vgchange commands and their --metadataprofile ProfileName and --detachprofile options or the --metadataprofile option during creation when using vgcreate or lvcreate command. The vgs and lvs reporting commands provide -o vg_profile and -o lv_profile output options to show the metadata profile currently attached to a Volume Group or a Logical Volume.
The set of options allowed for command profiles is mutually exclusive when compared to the set of options allowed for metadata profiles. The settings that belong to either of these two sets can’t be mixed together and LVM tools will reject such profiles.
LVM itself provides a few predefined configuration profiles. Users are allowed to add more profiles with different values if needed. For this purpose, there’s the command_profile_template.profile (for command profiles) and metadata_profile_template.profile (for metadata profiles) which contain all settings that are customizable by profiles of certain type. Users are encouraged to copy these template profiles and edit them as needed. Alternatively, the lvmconfig --file <ProfileName.profile> --type profilable-command <section> or lvmconfig --file <ProfileName.profile> --type profilable-metadata <section> can be used to generate a configuration with profilable settings in either of the type for given section and save it to new ProfileName.profile (if the section is not specified, all profilable settings are reported).
The profiles
are stored in /etc/lvm/profile directory by default.
This location can be changed by using the
config/profile_dir setting. Each profile
configuration is stored in ProfileName.profile file
in the profile directory. When referencing the profile, the
.profile suffix is left out.
tag config
See tags configuration setting description below.
When several configuration methods are used at the same time and when LVM looks for the value of a particular setting, it traverses this config cascade from left to right:
direct config override on command line → command profile config → metadata profile config → tag config → lvmlocal.conf → lvm.conf
No part of this cascade is compulsory. If there’s no setting value found at the end of the cascade, a default value is used for that setting. Use lvmconfig to check what settings are in use and what the default values are.
SYNTAX
This section describes the configuration file syntax.
Whitespace is not significant unless it is within quotes. This provides a wide choice of acceptable indentation styles. Comments begin with # and continue to the end of the line. They are treated as whitespace.
Here is an
informal grammar:
file = value*
A configuration file consists of a set of values.
value = section | assignment
A value can either be a new section, or an assignment.
section = identifier ’{’ value* ’}’
A section groups associated
values together. If the same section is encountered multiple
times, the contents of all instances are concatenated
together in the order of appearance.
It is denoted by a name and delimited by curly brackets.
e.g. |
backup { | |||
... | ||||
} |
assignment = identifier ’=’ ( array | type )
An assignment associates a type with an identifier. If the identifier contains forward slashes, those are interpreted as path delimiters. The statement section/key = value is equivalent to section { key = value }. If multiple instances of the same key are encountered, only the last value is used (and a warning is issued).
e.g. | |||
level = 7 |
array = ’[’ ( type ’,’)* type ’]’ | ’[’ ’]’
Inhomogeneous arrays are
supported.
Elements must be separated by commas.
An empty array is acceptable.
type = integer|float|string
integer =
[0-9]*
float =
[0-9]*’.’[0-9]*
string = ’"’ .*
’"’
Strings with spaces must be enclosed in double quotes, single words that start with a letter can be left unquoted.
SETTINGS
The lvmconfig command prints the LVM configuration settings in various ways. See the man page lvmconfig(8).
Command to
print a list of all possible config settings, with their
default values:
lvmconfig --type default
Command to
print a list of all possible config settings, with their
default values, and a full description of each as a comment:
lvmconfig --type default --withcomments
Command to
print a list of all possible config settings, with their
current values (configured, non-default values are shown):
lvmconfig --type current
Command to
print all config settings that have been configured with a
different value than the default (configured, non-default
values are shown):
lvmconfig --type diff
Command to
print a single config setting, with its default value, and a
full description, where "Section" refers to the
config section, e.g. global, and "Setting" refers
to the name of the specific setting, e.g. umask:
lvmconfig --type default --withcomments
Section/Setting
FILES
/etc/lvm/lvm.conf
/etc/lvm/lvmlocal.conf
/etc/lvm/archive
/etc/lvm/backup
/etc/lvm/cache/.cache
/etc/lvm/profile
/run/lock/lvm
SEE ALSO
lvm(8), lvmconfig(8)