| 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 "ae295a6ecfeaf67a1dd795723fd227f6">
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| 10 | <!ENTITY lvm2-size "2.5 MB">
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| 11 | <!ENTITY lvm2-buildsize "37 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 transient. 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 | <date>$Date$</date>
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| 23 | </sect1info>
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| 24 |
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| 25 | <title>LVM2-&lvm2-version;</title>
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| 26 |
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| 27 | <indexterm zone="lvm2">
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| 28 | <primary sortas="a-LVM2">LVM2</primary>
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| 29 | </indexterm>
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| 30 |
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| 31 | <sect2 role="package">
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| 32 | <title>Introduction to LVM2</title>
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| 33 |
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| 34 | <para>
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| 35 | The <application>LVM2</application> package is a set of tools that manage
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| 36 | logical partitions. It allows spanning of file systems across multiple
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| 37 | physical disks and disk partitions and provides for dynamic growing or
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| 38 | shrinking of logical partitions, mirroring and low storage footprint
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| 39 | snapshots.
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| 40 | </para>
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| 41 |
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| 42 | &lfs101_checked;
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| 43 |
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| 44 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 45 | <itemizedlist spacing="compact">
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| 46 | <listitem>
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| 47 | <para>
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| 48 | Download (HTTP): <ulink url="&lvm2-download-http;"/>
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| 49 | </para>
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| 50 | </listitem>
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| 51 | <listitem>
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| 52 | <para>
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| 53 | Download (FTP): <ulink url="&lvm2-download-ftp;"/>
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| 54 | </para>
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| 55 | </listitem>
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| 56 | <listitem>
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| 57 | <para>
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| 58 | Download MD5 sum: &lvm2-md5sum;
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| 59 | </para>
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| 60 | </listitem>
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| 61 | <listitem>
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| 62 | <para>
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| 63 | Download size: &lvm2-size;
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| 64 | </para>
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| 65 | </listitem>
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| 66 | <listitem>
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| 67 | <para>
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| 68 | Estimated disk space required: &lvm2-buildsize;
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| 69 | </para>
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| 70 | </listitem>
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| 71 | <listitem>
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| 72 | <para>
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| 73 | Estimated build time: &lvm2-time;
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| 74 | </para>
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| 75 | </listitem>
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| 76 | </itemizedlist>
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| 77 |
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| 78 | <bridgehead renderas="sect3">LVM2 Dependencies</bridgehead>
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| 79 |
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| 80 | <bridgehead renderas="sect4">Required</bridgehead>
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| 81 | <para role="required">
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| 82 | <xref linkend='libaio'/>
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| 83 | </para>
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| 84 |
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| 85 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 86 | <para role="optional">
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| 87 | <xref linkend='mdadm'/>,
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| 88 | <xref linkend='reiserfs'/>,
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| 89 | <xref linkend='valgrind'/>,
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| 90 | <xref linkend='which'/>,
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| 91 | <xref linkend='xfsprogs'/> (all five may be used, but are not required,
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| 92 | for tests),
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| 93 | <ulink url='https://github.com/jthornber/thin-provisioning-tools'>
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| 94 | thin-provisioning-tools</ulink>, and
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| 95 | <ulink url="https://github.com/dm-vdo/vdo">vdo</ulink>
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| 96 | </para>
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| 97 |
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| 98 | <para condition="html" role="usernotes">User Notes:
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| 99 | <ulink url="&blfs-wiki;/lvm2"/>
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| 100 | </para>
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| 101 |
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| 102 | </sect2>
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| 103 |
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| 104 | <sect2 role="kernel" id="lvm2-kernel">
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| 105 | <title>Kernel Configuration</title>
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| 106 |
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| 107 | <para>
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| 108 | Enable the following options in the kernel configuration
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| 109 | and recompile the kernel:
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| 110 | </para>
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| 111 |
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| 112 | <note><para>
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| 113 | There are several other Device Mapper options in the kernel beyond those
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| 114 | listed below. In order to get reasonable results if running the
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| 115 | regression tests, all must be enabled either internally or as a module.
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| 116 | The tests will all time out if Magic SysRq key is not enabled.
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| 117 | </para></note>
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| 118 |
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| 119 | <screen><literal>Device Drivers --->
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| 120 | [*] Multiple devices driver support (RAID and LVM) ---> [CONFIG_MD]
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| 121 | <*/M> Device mapper support [CONFIG_BLK_DEV_DM]
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| 122 | <*/M> Crypt target support [CONFIG_DM_CRYPT]
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| 123 | <*/M> Snapshot target [CONFIG_DM_SNAPSHOT]
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| 124 | <*/M> Thin provisioning target [CONFIG_DM_THIN_PROVISIONING]
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| 125 | <*/M> Mirror target [CONFIG_DM_MIRROR]
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| 126 | Kernel hacking --->
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| 127 | Generic Kernel Debugging Instruments --->
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| 128 | [*] Magic SysRq key [CONFIG_MAGIC_SYSRQ]</literal></screen>
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| 129 |
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| 130 | <indexterm zone="lvm2 lvm2-kernel">
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| 131 | <primary sortas="d-lvm2">lvm2</primary>
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| 132 | </indexterm>
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| 133 |
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| 134 | </sect2>
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| 135 |
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| 136 | <sect2 role="installation">
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| 137 | <title>Installation of LVM2</title>
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| 138 |
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| 139 | <para>
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| 140 | Install <application>LVM2</application> by running the following
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| 141 | commands:
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| 142 | </para>
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| 143 |
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| 144 | <screen><userinput>PATH+=:/usr/sbin \
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| 145 | ./configure --prefix=/usr \
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| 146 | --enable-cmdlib \
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| 147 | --enable-pkgconfig \
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| 148 | --enable-udev_sync &&
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| 149 | make &&</userinput></screen>
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| 150 |
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| 151 | <para>
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| 152 | The tests use <application>udev</application> for logical volume
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| 153 | synchronization, so the LVM udev rules and some utilities need to
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| 154 | be installed before running the tests. If you are installing
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| 155 | <application>LVM2</application> for the first time, and do not
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| 156 | want to install the full package before running the tests, the minimal
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| 157 | set of utilities can be installed by running the following instructions
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| 158 | as the <systemitem class="username">root</systemitem> user:
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| 159 | </para>
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| 160 |
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| 161 | <screen role="root"
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| 162 | remap="test"><userinput>make -C tools install_tools_dynamic &&
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| 163 | make -C udev install &&
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| 164 | make -C libdm install</userinput></screen>
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| 165 |
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| 166 | <para>
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| 167 | To test the results, issue, as the
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| 168 | <systemitem class="username">root</systemitem> user:
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| 169 | </para>
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| 170 |
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| 171 | <screen role="root"
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| 172 | remap="test"><userinput>make S=shell/thin-flags.sh check_local</userinput></screen>
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| 173 |
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| 174 | <para>
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| 175 | The <command>S=...</command> option allows to skip tests. The
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| 176 | <command>shell/thin-flags.sh</command> test has been reported to freeze
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| 177 | the computer.
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| 178 | Other targets are available and can be listed with
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| 179 | <command>make -C test help</command>. The test timings are very dependent
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| 180 | on the speed of the disk(s), and on the number of enabled kernel options.
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| 181 | </para>
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| 182 |
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| 183 | <!-- Results for LVM2.2.02.176:
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| 184 | ### 292 tests: 177 passed, 46 skipped, 0 timed out, 60 warned, 9 failed
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| 185 |
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| 186 | Results for LVM2.2.03.01:
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| 187 | ### 302 tests: 182 passed, 43 skipped, 0 timed out, 62 warned, 15 failed
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| 188 |
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| 189 | Results for LVM2.2.03.05:
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| 190 | ### 326 tests: 255 passed, 58 skipped, 0 timed out, 2 warned, 11 failed
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| 191 |
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| 192 | Results for LVM2.2.03.09:
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| 193 | ### 338 tests: 212 passed, 41 skipped, 0 timed out, 70 warned, 15 failed
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| 194 |
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| 195 | Results for LVM2.2.03.11:
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| 196 | ### 357 tests: 231 passed, 32 skipped, 0 timed out, 77 warned, 17 failed
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| 197 | -->
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| 198 |
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| 199 | <para>
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| 200 | The tests do not implement the <quote>expected fail</quote> possibility,
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| 201 | and a small number of test failures is expected by upstream. More
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| 202 | failures may happen because some kernel options are missing. For example,
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| 203 | the lack of the <emphasis>dm-delay</emphasis> device mapper target may
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| 204 | explain some failures. Some tests are flagged
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| 205 | <quote>warned</quote> if
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| 206 | <ulink url='https://github.com/jthornber/thin-provisioning-tools'>
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| 207 | thin-provisioning-tools</ulink> are not installed. A workaround is to
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| 208 | add the following flags to <command>configure</command>:
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| 209 | </para>
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| 210 |
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| 211 | <screen role="nodump"><userinput> --with-thin-check= \
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| 212 | --with-thin-dump= \
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| 213 | --with-thin-repair= \
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| 214 | --with-thin-restore= \
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| 215 | --with-cache-check= \
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| 216 | --with-cache-dump= \
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| 217 | --with-cache-repair= \
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| 218 | --with-cache-restore= \</userinput></screen>
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| 219 |
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| 220 | <para>
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| 221 | Some tests may hang. They can be removed if necessary, for example:
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| 222 | <command>rm test/shell/lvconvert-raid-reshape.sh</command>. The tests
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| 223 | generate a lot of kernel messages, which may clutter your terminal. You
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| 224 | can disable them by issuing <command>dmesg -D</command> before running
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| 225 | the tests (do not forget to issue <command>dmesg -E</command> when tests
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| 226 | are done).
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| 227 |
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| 228 | <note><simpara>The checks create device nodes in the /tmp directory. The
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| 229 | tests will fail if /tmp is mounted with the nodev
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| 230 | option.</simpara></note>
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| 231 | </para>
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| 232 |
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| 233 | <para>
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| 234 | Now, as the <systemitem class="username">root</systemitem> user:
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| 235 | </para>
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| 236 |
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| 237 | <screen role="root" revision="sysv"><userinput>make install</userinput></screen>
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| 238 |
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| 239 | <screen role="root" revision="systemd"><userinput>make install
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| 240 | make install_systemd_units</userinput></screen>
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| 241 |
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| 242 | </sect2>
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| 243 |
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| 244 | <sect2 role="commands">
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| 245 | <title>Command Explanations</title>
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| 246 |
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| 247 | <para>
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| 248 | <command>PATH+=:/usr/sbin</command>: The path
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| 249 | must contain
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| 250 | <filename class='directory'>/usr/sbin</filename> for proper system tool
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| 251 | detection by the <command>configure</command> script. This instruction
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| 252 | ensures that PATH is properly set even if you build as an unprivileged user.
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| 253 | </para>
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| 254 |
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| 255 | <para>
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| 256 | <parameter>--enable-cmdlib</parameter>: This switch enables
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| 257 | building of the shared command library. It is required
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| 258 | when building the event daemon.
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| 259 | </para>
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| 260 |
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| 261 | <para>
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| 262 | <parameter>--enable-pkgconfig</parameter>: This switch enables
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| 263 | installation of <command>pkg-config</command> support files.
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| 264 | </para>
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| 265 |
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| 266 | <para>
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| 267 | <parameter>--enable-udev_sync</parameter>: This switch enables
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| 268 | synchronisation with <application>Udev</application> processing.
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| 269 | </para>
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| 270 |
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| 271 | <para>
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| 272 | <option>--enable-dmeventd</option>: This switch enables
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| 273 | building of the <application>Device Mapper</application>
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| 274 | event daemon.
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| 275 | </para>
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| 276 |
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| 277 | <para revision="systemd">
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| 278 | <command>make install_systemd_units</command>: This is needed to install
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| 279 | a unit that activates logical volumes at boot. It is not installed
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| 280 | by default.
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| 281 | </para>
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| 282 |
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| 283 | </sect2>
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| 284 |
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| 285 | <sect2 role="content">
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| 286 | <title>Contents</title>
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| 287 |
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| 288 | <segmentedlist>
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| 289 | <segtitle>Installed Programs</segtitle>
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| 290 | <segtitle>Installed Libraries</segtitle>
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| 291 | <segtitle>Installed Directories</segtitle>
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| 292 |
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| 293 | <seglistitem>
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| 294 | <seg>
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| 295 | blkdeactivate, dmeventd (optional), dmsetup, fsadm, lvm, and lvmdump.
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| 296 | There are also numerous symbolic links to lvm that implement specific
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| 297 | functionalities
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| 298 | </seg>
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| 299 | <seg>
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| 300 | libdevmapper.so and liblvm2cmd.so; optional:
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| 301 | libdevmapper-event.so, libdevmapper-event-lvm2.so,
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| 302 | libdevmapper-event-lvm2mirror.so, libdevmapper-event-lvm2raid.so,
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| 303 | libdevmapper-event-lvm2snapshot.so, and libdevmapper-event-lvm2thin.so
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| 304 | </seg>
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| 305 | <seg>
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| 306 | /etc/lvm and
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| 307 | /lib/device-mapper (optional)
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| 308 | </seg>
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| 309 | </seglistitem>
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| 310 | </segmentedlist>
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| 311 |
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| 312 | <variablelist>
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| 313 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 314 | <?dbfo list-presentation="list"?>
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| 315 |
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| 316 | <?dbhtml list-presentation="table"?>
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| 317 |
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| 318 | <varlistentry id="blkdeactivate">
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| 319 | <term><command>blkdeactivate</command></term>
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| 320 | <listitem>
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| 321 | <para>
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| 322 | is a utility to deactivate block devices
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| 323 | </para>
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| 324 | <indexterm zone="lvm2 blkdeactivate">
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| 325 | <primary sortas="b-blkdeactivate">blkdeactivate</primary>
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| 326 | </indexterm>
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| 327 | </listitem>
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| 328 | </varlistentry>
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| 329 |
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| 330 | <varlistentry id="dmeventd">
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| 331 | <term><command>dmeventd</command></term>
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| 332 | <listitem>
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| 333 | <para>
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| 334 | (optional) is the Device Mapper event daemon
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| 335 | </para>
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| 336 | <indexterm zone="lvm2 dmeventd">
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| 337 | <primary sortas="b-dmeventd">dmeventd</primary>
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| 338 | </indexterm>
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| 339 | </listitem>
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| 340 | </varlistentry>
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| 341 |
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| 342 | <varlistentry id="dmsetup">
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| 343 | <term><command>dmsetup</command></term>
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| 344 | <listitem>
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| 345 | <para>
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| 346 | is a low level logical volume management tool
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| 347 | </para>
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| 348 | <indexterm zone="lvm2 dmsetup">
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| 349 | <primary sortas="b-dmsetup">dmsetup</primary>
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| 350 | </indexterm>
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| 351 | </listitem>
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| 352 | </varlistentry>
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| 353 |
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| 354 | <varlistentry id="fsadm">
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| 355 | <term><command>fsadm</command></term>
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| 356 | <listitem>
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| 357 | <para>
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| 358 | is a utility used to resize or check filesystem on a device
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| 359 | </para>
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| 360 | <indexterm zone="lvm2 fsadm">
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| 361 | <primary sortas="b-fsadm">fsadm</primary>
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| 362 | </indexterm>
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| 363 | </listitem>
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| 364 | </varlistentry>
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| 365 |
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| 366 | <varlistentry id="lvm">
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| 367 | <term><command>lvm</command></term>
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| 368 | <listitem>
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| 369 | <para>
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| 370 | provides the command-line tools for <application>LVM2</application>.
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| 371 | Commands are implemented via sympolic links to this program to
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| 372 | manage physical devices (pv*), volume groups (vg*) and logical
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| 373 | volumes (lv*)
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| 374 | </para>
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| 375 | <indexterm zone="lvm2 lvm">
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| 376 | <primary sortas="b-lvm">lvm</primary>
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| 377 | </indexterm>
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|---|
| 378 | </listitem>
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| 379 | </varlistentry>
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| 380 |
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| 381 | <!--
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| 382 | <varlistentry id="lvmconf">
|
|---|
| 383 | <term><command>lvmconf</command></term>
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|---|
| 384 | <listitem>
|
|---|
| 385 | <para>
|
|---|
| 386 | is a script that modifies the locking configuration in
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| 387 | the <application>LVM2</application> configuration file.
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| 388 | </para>
|
|---|
| 389 | <indexterm zone="lvm2 lvmconf">
|
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| 390 | <primary sortas="b-lvmconf">lvmconf</primary>
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| 391 | </indexterm>
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| 392 | </listitem>
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| 393 | </varlistentry>
|
|---|
| 394 | -->
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| 395 |
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| 396 | <varlistentry id="lvmdump">
|
|---|
| 397 | <term><command>lvmdump</command></term>
|
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| 398 | <listitem>
|
|---|
| 399 | <para>
|
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| 400 | is a tool used to dump various information concerning
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| 401 | <application>LVM2</application>
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| 402 | </para>
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| 403 | <indexterm zone="lvm2 lvmdump">
|
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| 404 | <primary sortas="b-lvmdump">lvmdump</primary>
|
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| 405 | </indexterm>
|
|---|
| 406 | </listitem>
|
|---|
| 407 | </varlistentry>
|
|---|
| 408 |
|
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| 409 | <varlistentry id="vgimportclone">
|
|---|
| 410 | <term><command>vgimportclone</command></term>
|
|---|
| 411 | <listitem>
|
|---|
| 412 | <para>
|
|---|
| 413 | is used to import a duplicated VG (e.g. hardware snapshot)
|
|---|
| 414 | </para>
|
|---|
| 415 | <indexterm zone="lvm2 vgimportclone">
|
|---|
| 416 | <primary sortas="b-vgimportclone">vgimportclone</primary>
|
|---|
| 417 | </indexterm>
|
|---|
| 418 | </listitem>
|
|---|
| 419 | </varlistentry>
|
|---|
| 420 |
|
|---|
| 421 | <varlistentry id="libdevmapper">
|
|---|
| 422 | <term><filename class="libraryfile">libdevmapper.so</filename></term>
|
|---|
| 423 | <listitem>
|
|---|
| 424 | <para>
|
|---|
| 425 | contains the <application>Device Mapper</application> API
|
|---|
| 426 | functions
|
|---|
| 427 | </para>
|
|---|
| 428 | <indexterm zone="lvm2 libdevmapper">
|
|---|
| 429 | <primary sortas="c-libdevmapper">libdevmapper.so</primary>
|
|---|
| 430 | </indexterm>
|
|---|
| 431 | </listitem>
|
|---|
| 432 | </varlistentry>
|
|---|
| 433 |
|
|---|
| 434 | </variablelist>
|
|---|
| 435 |
|
|---|
| 436 | </sect2>
|
|---|
| 437 |
|
|---|
| 438 | </sect1>
|
|---|
