| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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| 7 | <!ENTITY lvm2-download-http "https://sourceware.org/ftp/lvm2/LVM2.&lvm2-version;.tgz">
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| 8 | <!ENTITY lvm2-download-ftp "ftp://sourceware.org/pub/lvm2/LVM2.&lvm2-version;.tgz">
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| 9 | <!ENTITY lvm2-md5sum "81b7a8b59d3f7ecf9dc00f978f41d725">
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| 10 | <!ENTITY lvm2-size "2.4 MB">
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| 11 | <!ENTITY lvm2-buildsize "44 MB (add 27 MB for tests; transient files can grow up to around 800 MB in the /tmp directory during tests)">
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| 12 | <!-- My build size was 124 MB with tests, but I'll leave this here. -renodr
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| 13 | The files in /tmp are transcient. I monitor /tmp with a loop during
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| 14 | tests. -pierre, August 2020 -->
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| 15 | <!ENTITY lvm2-time "0.2 SBU (using parallelism=4; add 16 to 48 SBU for tests, depending on disk speed)">
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| 16 | ]>
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| 17 |
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| 18 | <sect1 id="lvm2" xreflabel="LVM2-&lvm2-version;">
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| 19 | <?dbhtml filename="lvm2.html"?>
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| 20 |
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| 21 | <sect1info>
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| 22 | <othername>$LastChangedBy$</othername>
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| 23 | <date>$Date$</date>
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| 24 | </sect1info>
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| 25 |
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| 26 | <title>LVM2-&lvm2-version;</title>
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| 27 |
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| 28 | <indexterm zone="lvm2">
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| 29 | <primary sortas="a-LVM2">LVM2</primary>
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| 30 | </indexterm>
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| 31 |
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| 32 | <sect2 role="package">
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| 33 | <title>Introduction to LVM2</title>
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| 34 |
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| 35 | <para>
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| 36 | The <application>LVM2</application> package is a set of tools that manage
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| 37 | logical partitions. It allows spanning of file systems across multiple
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| 38 | physical disks and disk partitions and provides for dynamic growing or
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| 39 | shrinking of logical partitions, mirroring and low storage footprint
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| 40 | snapshots.
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| 41 | </para>
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| 42 |
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| 43 | &lfs101_checked;
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| 44 |
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| 45 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 46 | <itemizedlist spacing="compact">
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| 47 | <listitem>
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| 48 | <para>
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| 49 | Download (HTTP): <ulink url="&lvm2-download-http;"/>
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| 50 | </para>
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| 51 | </listitem>
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| 52 | <listitem>
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| 53 | <para>
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| 54 | Download (FTP): <ulink url="&lvm2-download-ftp;"/>
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| 55 | </para>
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| 56 | </listitem>
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| 57 | <listitem>
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| 58 | <para>
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| 59 | Download MD5 sum: &lvm2-md5sum;
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| 60 | </para>
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| 61 | </listitem>
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| 62 | <listitem>
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| 63 | <para>
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| 64 | Download size: &lvm2-size;
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| 65 | </para>
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| 66 | </listitem>
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| 67 | <listitem>
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| 68 | <para>
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| 69 | Estimated disk space required: &lvm2-buildsize;
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| 70 | </para>
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| 71 | </listitem>
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| 72 | <listitem>
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| 73 | <para>
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| 74 | Estimated build time: &lvm2-time;
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| 75 | </para>
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| 76 | </listitem>
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| 77 | </itemizedlist>
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| 78 |
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| 79 | <bridgehead renderas="sect3">LVM2 Dependencies</bridgehead>
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| 80 |
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| 81 | <bridgehead renderas="sect4">Required</bridgehead>
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| 82 | <para role="required">
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| 83 | <xref linkend='libaio'/>
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| 84 | </para>
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| 85 |
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| 86 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 87 | <para role="optional">
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| 88 | <xref linkend='mdadm'/>,
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| 89 | <xref linkend='reiserfs'/>,
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| 90 | <xref linkend='valgrind'/>,
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| 91 | <xref linkend='which'/>,
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| 92 | <xref linkend='xfsprogs'/> (all five may be used, but are not required,
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| 93 | for tests),
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| 94 | <ulink url='https://github.com/jthornber/thin-provisioning-tools'>
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| 95 | thin-provisioning-tools</ulink>, and
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| 96 | <ulink url="https://github.com/dm-vdo/vdo">vdo</ulink>
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| 97 | </para>
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| 98 |
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| 99 | <para condition="html" role="usernotes">User Notes:
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| 100 | <ulink url="&blfs-wiki;/lvm2"/>
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| 101 | </para>
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| 102 |
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| 103 | </sect2>
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| 104 |
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| 105 | <sect2 role="kernel" id="lvm2-kernel">
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| 106 | <title>Kernel Configuration</title>
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| 107 |
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| 108 | <para>
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| 109 | Enable the following options in the kernel configuration
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| 110 | and recompile the kernel:
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| 111 | </para>
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| 112 |
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| 113 | <note><para>
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| 114 | There are several other Device Mapper options in the kernel beyond those
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| 115 | listed below. In order to get reasonable results if running the
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| 116 | regression tests, all must be enabled either internally or as a module.
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| 117 | The tests will all time out if Magic SysRq key is not enabled.
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| 118 | </para></note>
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| 119 |
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| 120 | <screen><literal>Device Drivers --->
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| 121 | [*] Multiple devices driver support (RAID and LVM) ---> [CONFIG_MD]
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| 122 | <*/M> Device mapper support [CONFIG_BLK_DEV_DM]
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| 123 | <*/M> Crypt target support [CONFIG_DM_CRYPT]
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| 124 | <*/M> Snapshot target [CONFIG_DM_SNAPSHOT]
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| 125 | <*/M> Thin provisioning target [CONFIG_DM_THIN_PROVISIONING]
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| 126 | <*/M> Mirror target [CONFIG_DM_MIRROR]
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| 127 | Kernel hacking --->
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| 128 | Generic Kernel Debugging Instruments --->
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| 129 | [*] Magic SysRq key [CONFIG_MAGIC_SYSRQ]</literal></screen>
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| 130 |
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| 131 | <indexterm zone="lvm2 lvm2-kernel">
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| 132 | <primary sortas="d-lvm2">lvm2</primary>
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| 133 | </indexterm>
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| 134 |
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| 135 | </sect2>
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| 136 |
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| 137 | <sect2 role="installation">
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| 138 | <title>Installation of LVM2</title>
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| 139 |
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| 140 | <para>
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| 141 | Install <application>LVM2</application> by running the following
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| 142 | commands:
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| 143 | </para>
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| 144 |
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| 145 | <screen><userinput>SAVEPATH=$PATH &&
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| 146 | PATH=$PATH:/sbin:/usr/sbin &&
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| 147 | ./configure --prefix=/usr \
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| 148 | --exec-prefix= \
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| 149 | --enable-cmdlib \
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| 150 | --enable-pkgconfig \
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| 151 | --enable-udev_sync &&
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| 152 | make &&
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| 153 | PATH=$SAVEPATH &&
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| 154 | unset SAVEPATH</userinput></screen>
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| 155 |
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| 156 | <para>
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| 157 | The tests use <application>udev</application> for logical volume
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| 158 | synchronization, so the LVM udev rules and some utilities need to
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| 159 | be installed before running the tests. If you are installing
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| 160 | <application>LVM2</application> for the first time, and do not
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| 161 | want to install the full package before running the tests, the minimal
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| 162 | set of utilities can be installed by running the following instructions
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| 163 | as the <systemitem class="username">root</systemitem> user:
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| 164 | </para>
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| 165 |
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| 166 | <screen role="root"
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| 167 | remap="test"><userinput>make -C tools install_tools_dynamic &&
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| 168 | make -C udev install &&
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| 169 | make -C libdm install</userinput></screen>
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| 170 |
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| 171 | <para>
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| 172 | To test the results, issue, as the
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| 173 | <systemitem class="username">root</systemitem> user:
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| 174 | </para>
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| 175 |
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| 176 | <screen role="root"
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| 177 | remap="test"><userinput>make S=shell/thin-flags.sh check_local</userinput></screen>
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| 178 |
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| 179 | <para>
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| 180 | The <command>S=...</command> option allows to skip tests. The
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| 181 | <command>shell/thin-flags.sh</command> test has been reported to freeze
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| 182 | the computer.
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| 183 | Other targets are available and can be listed with
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| 184 | <command>make -C test help</command>. The test timings are very dependent
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| 185 | on the speed of the disk(s), and on the number of enabled kernel options.
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| 186 | </para>
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| 187 |
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| 188 | <!-- Results for LVM2.2.02.176:
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| 189 | ### 292 tests: 177 passed, 46 skipped, 0 timed out, 60 warned, 9 failed
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| 190 |
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| 191 | Results for LVM2.2.03.01:
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| 192 | ### 302 tests: 182 passed, 43 skipped, 0 timed out, 62 warned, 15 failed
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| 193 |
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| 194 | Results for LVM2.2.03.05:
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| 195 | ### 326 tests: 255 passed, 58 skipped, 0 timed out, 2 warned, 11 failed
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| 196 |
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| 197 | Results for LVM2.2.03.09:
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| 198 | ### 338 tests: 212 passed, 41 skipped, 0 timed out, 70 warned, 15 failed
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| 199 |
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| 200 | Results for LVM2.2.03.11:
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| 201 | ### 357 tests: 231 passed, 32 skipped, 0 timed out, 77 warned, 17 failed
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| 202 | -->
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| 203 |
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| 204 | <para>
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| 205 | The tests do not implement the <quote>expected fail</quote> possibility,
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| 206 | and a small number of test failures is expected by upstream. More
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| 207 | failures may happen because some kernel options are missing. For example,
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| 208 | the lack of the <emphasis>dm-delay</emphasis> device mapper target may
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| 209 | explain some failures. Some tests are flagged
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| 210 | <quote>warned</quote> if
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| 211 | <ulink url='https://github.com/jthornber/thin-provisioning-tools'>
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| 212 | thin-provisioning-tools</ulink> are not installed. A workaround is to
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| 213 | add the following flags to <command>configure</command>:
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| 214 | </para>
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| 215 |
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| 216 | <screen role="nodump"><userinput> --with-thin-check= \
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| 217 | --with-thin-dump= \
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| 218 | --with-thin-repair= \
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| 219 | --with-thin-restore= \
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| 220 | --with-cache-check= \
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| 221 | --with-cache-dump= \
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| 222 | --with-cache-repair= \
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| 223 | --with-cache-restore= \</userinput></screen>
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| 224 |
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| 225 | <para>
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| 226 | Some tests may hang. They can be removed if necessary, for example:
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| 227 | <command>rm test/shell/lvconvert-raid-reshape.sh</command>. The tests
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| 228 | generate a lot of kernel messages, which may clutter your terminal. You
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| 229 | can disable them by issuing <command>dmesg -D</command> before running
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| 230 | the tests (do not forget to issue <command>dmesg -E</command> when tests
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| 231 | are done).
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| 232 |
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| 233 | <note><simpara>The checks create device nodes in the /tmp directory. The
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| 234 | tests will fail if /tmp is mounted with the nodev
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| 235 | option.</simpara></note>
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| 236 | </para>
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| 237 |
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| 238 | <para>
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| 239 | Now, as the <systemitem class="username">root</systemitem> user:
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| 240 | </para>
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| 241 |
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| 242 | <screen role="root" revision="sysv"><userinput>make install</userinput></screen>
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| 243 |
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| 244 | <screen role="root" revision="systemd"><userinput>make install
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| 245 | make install_systemd_units</userinput></screen>
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| 246 |
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| 247 | </sect2>
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| 248 |
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| 249 | <sect2 role="commands">
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| 250 | <title>Command Explanations</title>
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| 251 |
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| 252 | <para>
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| 253 | <command>PATH=$PATH:/sbin:/usr/sbin</command>: The path
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| 254 | must contain <filename class="directory">/sbin</filename> and
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| 255 | <filename class='directory'>/usr/sbin</filename> for proper system tool
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| 256 | detection by the <command>configure</command> script. This instruction
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| 257 | ensures that PATH is properly set even if you build as an unprivileged user.
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| 258 | </para>
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| 259 |
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| 260 | <para>
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| 261 | <parameter>--enable-cmdlib</parameter>: This switch enables
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| 262 | building of the shared command library. It is required
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| 263 | when building the event daemon.
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| 264 | </para>
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| 265 |
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| 266 | <para>
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| 267 | <parameter>--enable-pkgconfig</parameter>: This switch enables
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| 268 | installation of <command>pkg-config</command> support files.
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| 269 | </para>
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| 270 |
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| 271 | <para>
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| 272 | <parameter>--enable-udev_sync</parameter>: This switch enables
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| 273 | synchronisation with <application>Udev</application> processing.
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| 274 | </para>
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| 275 |
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| 276 | <para>
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| 277 | <option>--enable-dmeventd</option>: This switch enables
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| 278 | building of the <application>Device Mapper</application>
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| 279 | event daemon.
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| 280 | </para>
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| 281 |
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| 282 | <para revision="systemd">
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| 283 | <command>make install_systemd_units</command>: This is needed to install
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| 284 | a unit that activates logical volumes at boot. It is not installed
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| 285 | by default.
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| 286 | </para>
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| 287 |
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| 288 | </sect2>
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| 289 |
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| 290 | <sect2 role="content">
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| 291 | <title>Contents</title>
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| 292 |
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| 293 | <segmentedlist>
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| 294 | <segtitle>Installed Programs</segtitle>
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| 295 | <segtitle>Installed Libraries</segtitle>
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| 296 | <segtitle>Installed Directories</segtitle>
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| 297 |
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| 298 | <seglistitem>
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| 299 | <seg>
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| 300 | blkdeactivate, dmeventd (optional), dmsetup, fsadm, lvm, and lvmdump.
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| 301 | There are also numerous symbolic links to lvm that implement specific
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| 302 | functionalities
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| 303 | </seg>
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| 304 | <seg>
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| 305 | libdevmapper.so and liblvm2cmd.so; optional:
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| 306 | libdevmapper-event.so, libdevmapper-event-lvm2.so,
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| 307 | libdevmapper-event-lvm2mirror.so, libdevmapper-event-lvm2raid.so,
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| 308 | libdevmapper-event-lvm2snapshot.so, and libdevmapper-event-lvm2thin.so
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| 309 | </seg>
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| 310 | <seg>
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| 311 | /etc/lvm and
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| 312 | /lib/device-mapper (optional)
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| 313 | </seg>
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| 314 | </seglistitem>
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| 315 | </segmentedlist>
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| 316 |
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| 317 | <variablelist>
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| 318 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 319 | <?dbfo list-presentation="list"?>
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| 320 |
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| 321 | <?dbhtml list-presentation="table"?>
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| 322 |
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| 323 | <varlistentry id="blkdeactivate">
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| 324 | <term><command>blkdeactivate</command></term>
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| 325 | <listitem>
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| 326 | <para>
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| 327 | is a utility to deactivate block devices
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| 328 | </para>
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| 329 | <indexterm zone="lvm2 blkdeactivate">
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| 330 | <primary sortas="b-blkdeactivate">blkdeactivate</primary>
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| 331 | </indexterm>
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| 332 | </listitem>
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| 333 | </varlistentry>
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| 334 |
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| 335 | <varlistentry id="dmeventd">
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| 336 | <term><command>dmeventd</command></term>
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| 337 | <listitem>
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| 338 | <para>
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| 339 | (optional) is the Device Mapper event daemon
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| 340 | </para>
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| 341 | <indexterm zone="lvm2 dmeventd">
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| 342 | <primary sortas="b-dmeventd">dmeventd</primary>
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| 343 | </indexterm>
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| 344 | </listitem>
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| 345 | </varlistentry>
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| 346 |
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| 347 | <varlistentry id="dmsetup">
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| 348 | <term><command>dmsetup</command></term>
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| 349 | <listitem>
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| 350 | <para>
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| 351 | is a low level logical volume management tool
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| 352 | </para>
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| 353 | <indexterm zone="lvm2 dmsetup">
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| 354 | <primary sortas="b-dmsetup">dmsetup</primary>
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| 355 | </indexterm>
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| 356 | </listitem>
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| 357 | </varlistentry>
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| 358 |
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| 359 | <varlistentry id="fsadm">
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| 360 | <term><command>fsadm</command></term>
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| 361 | <listitem>
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| 362 | <para>
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| 363 | is a utility used to resize or check filesystem on a device
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| 364 | </para>
|
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| 365 | <indexterm zone="lvm2 fsadm">
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| 366 | <primary sortas="b-fsadm">fsadm</primary>
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| 367 | </indexterm>
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| 368 | </listitem>
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| 369 | </varlistentry>
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| 370 |
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| 371 | <varlistentry id="lvm">
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| 372 | <term><command>lvm</command></term>
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| 373 | <listitem>
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| 374 | <para>
|
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| 375 | provides the command-line tools for <application>LVM2</application>.
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| 376 | Commands are implemented via sympolic links to this program to
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| 377 | manage physical devices (pv*), volume groups (vg*) and logical
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| 378 | volumes (lv*)
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| 379 | </para>
|
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| 380 | <indexterm zone="lvm2 lvm">
|
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| 381 | <primary sortas="b-lvm">lvm</primary>
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| 382 | </indexterm>
|
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| 383 | </listitem>
|
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| 384 | </varlistentry>
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| 385 |
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| 386 | <!--
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| 387 | <varlistentry id="lvmconf">
|
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| 388 | <term><command>lvmconf</command></term>
|
|---|
| 389 | <listitem>
|
|---|
| 390 | <para>
|
|---|
| 391 | is a script that modifies the locking configuration in
|
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| 392 | the <application>LVM2</application> configuration file.
|
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| 393 | </para>
|
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| 394 | <indexterm zone="lvm2 lvmconf">
|
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| 395 | <primary sortas="b-lvmconf">lvmconf</primary>
|
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| 396 | </indexterm>
|
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| 397 | </listitem>
|
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| 398 | </varlistentry>
|
|---|
| 399 | -->
|
|---|
| 400 |
|
|---|
| 401 | <varlistentry id="lvmdump">
|
|---|
| 402 | <term><command>lvmdump</command></term>
|
|---|
| 403 | <listitem>
|
|---|
| 404 | <para>
|
|---|
| 405 | is a tool used to dump various information concerning
|
|---|
| 406 | <application>LVM2</application>
|
|---|
| 407 | </para>
|
|---|
| 408 | <indexterm zone="lvm2 lvmdump">
|
|---|
| 409 | <primary sortas="b-lvmdump">lvmdump</primary>
|
|---|
| 410 | </indexterm>
|
|---|
| 411 | </listitem>
|
|---|
| 412 | </varlistentry>
|
|---|
| 413 |
|
|---|
| 414 | <varlistentry id="vgimportclone">
|
|---|
| 415 | <term><command>vgimportclone</command></term>
|
|---|
| 416 | <listitem>
|
|---|
| 417 | <para>
|
|---|
| 418 | is used to import a duplicated VG (e.g. hardware snapshot)
|
|---|
| 419 | </para>
|
|---|
| 420 | <indexterm zone="lvm2 vgimportclone">
|
|---|
| 421 | <primary sortas="b-vgimportclone">vgimportclone</primary>
|
|---|
| 422 | </indexterm>
|
|---|
| 423 | </listitem>
|
|---|
| 424 | </varlistentry>
|
|---|
| 425 |
|
|---|
| 426 | <varlistentry id="libdevmapper">
|
|---|
| 427 | <term><filename class="libraryfile">libdevmapper.so</filename></term>
|
|---|
| 428 | <listitem>
|
|---|
| 429 | <para>
|
|---|
| 430 | contains the <application>Device Mapper</application> API
|
|---|
| 431 | functions
|
|---|
| 432 | </para>
|
|---|
| 433 | <indexterm zone="lvm2 libdevmapper">
|
|---|
| 434 | <primary sortas="c-libdevmapper">libdevmapper.so</primary>
|
|---|
| 435 | </indexterm>
|
|---|
| 436 | </listitem>
|
|---|
| 437 | </varlistentry>
|
|---|
| 438 |
|
|---|
| 439 | </variablelist>
|
|---|
| 440 |
|
|---|
| 441 | </sect2>
|
|---|
| 442 |
|
|---|
| 443 | </sect1>
|
|---|
