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<?xml version='1.0' encoding="UTF-8"?> |
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<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/lvm2.xml,v 1.19 2006/02/17 02:53:19 rane Exp $ --> |
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<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> |
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|
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<guide link="/doc/en/lvm2.xml"> |
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<title>Gentoo LVM2 installation</title> |
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|
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<author title="Author"> |
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<mail link="avi@CFFtechnologies.com">Avi Schwartz</mail> |
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</author> |
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<author title="Contributor"> |
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<mail link="rajiv@gentoo.org">Rajiv Manglani</mail> |
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</author> |
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<author title="Editor"> |
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<mail link="neysx@gentoo.org">Xavier Neys</mail> |
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</author> |
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|
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<abstract> |
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This guide describes how to setup your Gentoo machine using the Logical Volume |
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Manager version 2 (LVM2). |
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</abstract> |
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|
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<!-- The content of this document is licensed under the CC-BY-SA license --> |
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<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> |
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<license/> |
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|
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<version>2.3</version> |
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<date>2006-04-20</date> |
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|
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<chapter> |
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<title>Introduction</title> |
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<section> |
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<body> |
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|
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<p> |
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This guide is based on an example with two IDE hard disks. It means that you |
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will more than likely need to change the drive, partition names and partition |
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sizes to match your own setup and needs. |
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</p> |
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|
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<warn> |
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This document is not intended to be an LVM2 tutorial. It serves as a |
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supplement to the Gentoo installation procedure as described in the <uri |
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link="/doc/en/handbook/handbook-x86.xml?part=1">Handbook, Part 1</uri>. Make |
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sure you <e>read</e> the Gentoo Installation Manual <e>before</e> you start |
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your installation process. |
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</warn> |
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|
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<note> |
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For a complete LVM HOWTO point your browser to |
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<uri>http://tldp.org/HOWTO/LVM-HOWTO</uri> |
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</note> |
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|
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</body> |
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</section> |
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<section> |
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<title>Initial requirements</title> |
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<body> |
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|
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<p> |
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If you do a fresh install of Gentoo, you will need to use a bootable CD with |
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LVM2 support such as a Gentoo Installation CD. You can find the Installation CDs for an x86 |
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architecture on our <uri |
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link="/main/en/mirrors.xml">mirrors</uri> under |
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<path>/releases/x86/2005.1-r1/installcd</path>. Other architectures might |
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be supported as well. |
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</p> |
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|
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<p> |
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If you install LVM2 on a currently running system with some spare hard disk |
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space, you will need to enable the LVM2 module (<path>dm-mod</path>). This |
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module is available in <path>gentoo-sources</path> and in |
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<path>vanilla-sources</path>. |
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Compiling your kernel and getting LVM2 to work is covered later in this guide. |
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</p> |
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|
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<p> |
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Not all 2.4 kernels provided by Gentoo support LVM2! |
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</p> |
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|
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<warn> |
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The LVM2 available on the 2005.0 installation CDs is erroneously linked |
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dynamically against a library (libgpm) which resides in /usr. This means you |
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cannot have your /usr in an LVM environment as well. Either install the latest |
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version or version 2.0.33 (not -r1) which are built statically. |
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</warn> |
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|
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</body> |
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</section> |
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<section> |
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<title>Partitions</title> |
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<body> |
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|
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<p> |
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Our example system has two IDE hard disks and will be partitioned as follows: |
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</p> |
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|
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<ul> |
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<li>/dev/hda1 -- /boot</li> |
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<li>/dev/hda2 -- (swap)</li> |
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<li>/dev/hda3 -- /</li> |
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<li>/dev/hda4 -- Will be used by LVM2</li> |
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<li>/dev/hdb1 -- Will be used by LVM2</li> |
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</ul> |
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|
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<impo> |
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Pay attention to the partition names as it is easy to confuse the a's and b's, |
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and the partition numbers. One false move could wipe out the wrong partition. |
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You have been warned! |
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</impo> |
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|
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<p> |
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OK, time to start... |
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</p> |
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|
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</body> |
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</section> |
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</chapter> |
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|
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<chapter> |
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<title>Installation</title> |
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<section> |
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<body> |
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|
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<p> |
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Follow the handbook, but with the following amendments to chapter <e>4. |
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Preparing the Disks</e>: |
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</p> |
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|
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<p> |
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Use <c>fdisk</c> as described in the handbook, but use the partition scheme |
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mentioned above as an example. It is only <e>an example</e>, adapt it to your |
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own needs. |
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</p> |
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|
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<p> |
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Create a small physical <path>/boot</path> partition (hda1). In this example, |
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<path>/boot</path> will be not managed by LVM2. This partition will contain |
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your bootloader and your kernel(s). A 64MB partition should be well enough for |
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quite a few kernel generations. |
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</p> |
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|
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<p> |
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Create a swap partition (hda2). |
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</p> |
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|
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<p> |
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Create a / (root) partition (hda3). If you are interested in trying to put your |
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root partition under LVM management (which we do not recommend), see the |
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resources section at the end of this guide for a link to a mini-howto on how to |
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do this. The size of the root partition need not be large if you will keep |
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<path>/opt /usr /home /var</path> and <path>/tmp</path> in an LVM2 Volume Group |
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(vg). In this case, 1GB should be sufficient. |
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</p> |
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|
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<note> |
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It is <b>not</b> recommended to put the following directories in an |
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LVM2 partition: <path>/etc</path>, <path>/lib</path>, <path>/mnt</path>, |
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<path>/proc</path>, <path>/sbin</path>, <path>/dev</path>, and <path>/root</path>. |
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This way, you would still be able to log into your system (crippled, but |
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still somewhat usable, as root) if something goes terribly wrong. |
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</note> |
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|
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<p> |
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Assuming the <path>/boot</path>, swap and root partitions do not use the whole |
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physical disk, create a fourth partition on this disk and set it to type 8e |
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(Linux LVM). If you have more physical drives you would like to use with LVM, |
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create one partition on each and give them the same type (8e). |
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</p> |
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|
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<note> |
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Considering the huge size of current disks, you might consider splitting your |
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hard disks into smaller partitions instead of creating a big partition that |
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will be added to an LVM2 volume group in one block. LVM2 makes it easy to |
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extend your volumes after all. This leaves you some unallocated partitions you |
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might need to use outside of an LVM2 group. In short, don't use your disk space |
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until you know you need it. As an example, one contributor had split his |
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160 Gb hard disk into 8 partitions of 20 Gb each. |
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</note> |
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|
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<p> |
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Create the filesystems on <path>/dev/hda1</path> and <path>/dev/hda3</path>, |
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and create and activate the swap on <path>/dev/hda2</path> as described in the |
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handbook. |
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</p> |
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|
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<p> |
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Load the LVM2 <path>dm-mod</path> module. |
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</p> |
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|
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<pre caption="Loading the LVM2 module"> |
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# <i>modprobe dm-mod</i> |
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</pre> |
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|
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<p> |
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Before scanning and activating LVM, you might want to edit |
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<path>/etc/lvm/lvm.conf</path> to exclude some devices. By default, LVM2 will |
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scan all devices, even your CDROM which can generate error messages. In the |
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following example, the line that allows scanning of all devices is replaced by |
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one that rejects every device but our two IDE disks. |
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</p> |
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|
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<pre caption="Activating LVM"> |
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<comment>(Avoid scanning all devices but our disks)</comment> |
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# <i>nano -w /etc/lvm/lvm.conf</i> |
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<comment>(Look for the following line)</comment> |
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filter = [ "a/.*/" ] |
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<comment>(Replace it with the following one to scan |
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/dev/hda and /dev/hdb and reject anything else)</comment> |
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filter = [ "a|/dev/hd[ab]|", "r/.*/" ] |
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<comment>(Save the file and quit nano)</comment> |
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# <i>vgscan</i> |
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Reading all physical volumes. This may take a while... |
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No volume groups found |
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<comment>(Make any previously set up volume groups available)</comment> |
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# <i>vgchange -a y</i> |
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</pre> |
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|
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<p> |
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Prepare the partitions. |
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</p> |
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|
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<pre caption="Preparing the partitions"> |
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# <i>pvcreate /dev/hda4 /dev/hdb1</i> |
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No physical volume label read from /dev/hda4 |
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Physical volume "/dev/hda4" successfully created |
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No physical volume label read from /dev/hdb1 |
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Physical volume "/dev/hdb1" successfully created |
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</pre> |
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|
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<p> |
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Setup a volume group. A volume group is the result of combining several |
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physical units into a single logical device. |
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</p> |
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|
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<p> |
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In our example, <path>/dev/hda1</path>, <path>/dev/hda2</path> and |
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<path>/dev/hda3</path> are the <path>/boot</path>, swap and root partitions so |
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we need to combine <path>/dev/hda4</path> and <path>/dev/hdb1</path>. It can be |
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done with a single command, but, as an example, we will create our volume group |
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and extend it. |
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</p> |
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|
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<pre caption="Creating and extending a volume group"> |
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<comment>(Create a volume group named vg)</comment> |
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# <i>vgcreate vg /dev/hda4</i> |
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/etc/lvm/backup: fsync failed: Invalid argument <comment>(Ignore this warning)</comment> |
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Volume group "vg" successfully created |
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<comment>(Extending an existing volume group)</comment> |
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# <i>vgextend vg /dev/hdb1</i> |
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/etc/lvm/backup: fsync failed: Invalid argument <comment>(Ignore this warning, again and later as well)</comment> |
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Volume group "vg" successfully extended |
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</pre> |
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|
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<p> |
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Create the logical volumes. Logical volumes are the equivalent of partitions |
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you would create using fdisk in a non LVM2 environment. In our example, we |
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create the following partitions: |
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</p> |
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|
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<table> |
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<tr> |
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<th>Directory</th> |
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<th>Size</th> |
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</tr> |
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<tr> |
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<ti>/usr</ti> |
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<ti>10 GB</ti> |
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</tr> |
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<tr> |
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<ti>/home</ti> |
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<ti>5 GB</ti> |
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</tr> |
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<tr> |
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<ti>/opt</ti> |
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<ti>5 GB</ti> |
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</tr> |
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<tr> |
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<ti>/var</ti> |
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<ti>10 GB</ti> |
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</tr> |
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<tr> |
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<ti>/tmp</ti> |
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<ti>2 GB</ti> |
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</tr> |
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</table> |
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|
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<p> |
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Since we are going to use LVM2, we should not worry too much about partition |
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sizes because they can always be expanded as needed. |
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</p> |
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|
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<note> |
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As Terje Kvernes commented, it is easier to increase the size of a partition |
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then to shrink it. You might therefore want to start with smaller partitions |
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and increase their size as needed. |
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</note> |
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|
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<pre caption="Creating and extending logical volumes"> |
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# <i>lvcreate -L10G -nusr vg</i> |
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Logical volume "usr" created <comment>(Further similar messages not displayed)</comment> |
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# <i>lvcreate -L5G -nhome vg</i> |
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# <i>lvcreate -L5G -nopt vg</i> |
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# <i>lvcreate -L10G -nvar vg</i> |
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# <i>lvcreate -L2G -ntmp vg</i> |
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<comment>(As an example, let's extend a logical volume with 5 extra Gbytes)</comment> |
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# <i>lvextend -L+5G /dev/vg/home</i> |
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</pre> |
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|
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<p> |
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Create filesystems on the logical volumes the same way you would on a regular |
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partition. We use ext3 on the logical volumes but any filesystem of your |
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choice will work: |
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</p> |
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|
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<pre caption="Creating the filesystems"> |
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# <i>mke2fs -j /dev/vg/usr</i> |
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# <i>mke2fs -j /dev/vg/home</i> |
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# <i>mke2fs -j /dev/vg/opt</i> |
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# <i>mke2fs -j /dev/vg/var</i> |
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# <i>mke2fs -j /dev/vg/tmp</i> |
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</pre> |
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|
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<p> |
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Mount your partitions as described in the handbook and mount your LVM2 logical |
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volumes as if they were partitions. Replace the usual <path>/dev/hdxx</path> |
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with <path>/dev/vg/logical_volumename</path>. |
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</p> |
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|
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<pre caption="Mounting your logical volumes"> |
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<comment>(Make sure you have mounted your root partition as described in the handbook first)</comment> |
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# <i>mkdir /mnt/gentoo/usr</i> |
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# <i>mount /dev/vg/usr /mnt/gentoo/usr</i> |
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# <i>mkdir /mnt/gentoo/home</i> |
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# <i>mount /dev/vg/home /mnt/gentoo/home</i> |
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# <i>mkdir /mnt/gentoo/opt</i> |
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# <i>mount /dev/vg/opt /mnt/gentoo/opt</i> |
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# <i>mkdir /mnt/gentoo/var</i> |
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# <i>mount /dev/vg/var /mnt/gentoo/var</i> |
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# <i>mkdir /mnt/gentoo/tmp</i> |
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# <i>mount /dev/vg/tmp /mnt/gentoo/tmp</i> |
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</pre> |
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|
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<note> |
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The rest of the installation handbook is mostly unchanged so we shall not |
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walk you through it again except to point out differences. |
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</note> |
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|
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<p> |
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When configuring your kernel, make sure to configure your kernel to |
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support LVM2 (not all 2.4 kernels do). Select the LVM2 module as follows: |
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</p> |
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|
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<pre caption="Selecting the LVM2 module in a 2.4.x kernel"> |
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Multi-device support (RAID and LVM) ---> |
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[*] Multiple devices driver support (RAID and LVM) |
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< > RAID support |
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<comment>(Note that LVM is not selected on purpose, this was for LVM1)</comment> |
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< > Logical volume manager (LVM) support |
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<M> Device-mapper support |
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< > Mirror (RAID-1) support |
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</pre> |
| 363 |
|
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<pre caption="Selecting the LVM2 module in a 2.6.x kernel"> |
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Device Drivers ---> |
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Multi-device support (RAID and LVM) ---> |
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[*] Multiple devices driver support (RAID and LVM) |
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< > RAID support |
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<M> Device mapper support |
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</pre> |
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|
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<p> |
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The compiled module is called <path>dm-mod.ko</path> |
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</p> |
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|
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<p> |
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After you have built your kernel and installed its modules, add the following |
| 378 |
line to your <path>/etc/modules.autoload.d/kernel-{KV}</path> where {KV} |
| 379 |
represents your kernel version (2.4 or 2.6) so that the LVM2 module gets loaded |
| 380 |
when your machine is booted: |
| 381 |
</p> |
| 382 |
|
| 383 |
<pre caption="Adding the LVM2 module into /etc/modules.autoload.d/kernel-2.6"> |
| 384 |
# <i>nano -w /etc/modules.autoload.d/kernel-2.6</i> |
| 385 |
<comment>(Add the following line)</comment> |
| 386 |
dm-mod |
| 387 |
</pre> |
| 388 |
|
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<p> |
| 390 |
Now, install the lvm2 package. |
| 391 |
</p> |
| 392 |
|
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<impo> |
| 394 |
Make sure your <path>/usr/src/linux</path> link points to the kernel sources you |
| 395 |
are using because the lvm2 ebuild depends on the device-mapper ebuild which |
| 396 |
will check the presence of a required source file under |
| 397 |
<path>/usr/src/linux/include/linux</path>. |
| 398 |
</impo> |
| 399 |
|
| 400 |
<pre caption="Emerging the LVM2 package"> |
| 401 |
# <i>emerge lvm2</i> |
| 402 |
</pre> |
| 403 |
|
| 404 |
<p> |
| 405 |
Edit <path>/etc/lvm/lvm.conf</path> as described <uri |
| 406 |
link="#doc_chap2_pre2">earlier</uri>. The file you previously edited is part of |
| 407 |
your installation environment and will disappear after the next reboot. This |
| 408 |
time, you edit the real one inside your new Gentoo install. |
| 409 |
</p> |
| 410 |
|
| 411 |
<p> |
| 412 |
When editing your <path>/etc/fstab</path> file, follow the handbook and add |
| 413 |
your LVM2 logical volumes as needed. Again, here are a few lines needed for |
| 414 |
our example: |
| 415 |
</p> |
| 416 |
|
| 417 |
<pre caption="Extract of /etc/fstab"> |
| 418 |
/dev/hda1 /boot ext3 noauto,noatime 1 2 |
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/dev/hda2 none swap sw 0 0 |
| 420 |
/dev/hda3 / ext3 noatime 0 1 |
| 421 |
# Logical volumes |
| 422 |
/dev/vg/usr /usr ext3 noatime 0 2 |
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/dev/vg/home /home ext3 noatime 0 2 |
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/dev/vg/opt /opt ext3 noatime 0 2 |
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/dev/vg/var /var ext3 noatime 0 2 |
| 426 |
/dev/vg/tmp /tmp ext3 noatime 0 2 |
| 427 |
</pre> |
| 428 |
|
| 429 |
<p> |
| 430 |
When you reach the end of the installation part of the handbook, don't forget |
| 431 |
to umount all your LVM2 logical volumes as well and for a good measure run the |
| 432 |
following command before you reboot: |
| 433 |
</p> |
| 434 |
|
| 435 |
<pre caption="Shutting down LVM2"> |
| 436 |
# <i>vgchange -a n</i> |
| 437 |
</pre> |
| 438 |
|
| 439 |
<p> |
| 440 |
Restart your machine and all partitions should be visible and mounted. |
| 441 |
</p> |
| 442 |
|
| 443 |
</body> |
| 444 |
</section> |
| 445 |
</chapter> |
| 446 |
|
| 447 |
<chapter> |
| 448 |
<title>Continuing After a Reboot</title> |
| 449 |
<section> |
| 450 |
<body> |
| 451 |
|
| 452 |
<p> |
| 453 |
If you have interrupted the Gentoo installation at one point and want to |
| 454 |
continue, you need to create the volume device nodes first: |
| 455 |
</p> |
| 456 |
|
| 457 |
<pre caption="Reactivating the volumes"> |
| 458 |
# <i>vgscan --mknodes</i> |
| 459 |
</pre> |
| 460 |
|
| 461 |
<p> |
| 462 |
Installation CDs with less recent tools might need to reactivate the volumes |
| 463 |
instead: |
| 464 |
</p> |
| 465 |
|
| 466 |
<pre caption="Reactivating the volumes"> |
| 467 |
<comment>(Deactivate all volumes first)</comment> |
| 468 |
# <i>vgchange -a n</i> |
| 469 |
<comment>(Export all the volumes)</comment> |
| 470 |
# <i>vgexport -a vg</i> |
| 471 |
<comment>(Import all volumes)</comment> |
| 472 |
# <i>vgimport -a vg</i> |
| 473 |
<comment>(Reactivate all volumes)</comment> |
| 474 |
# <i>vgchange -a y</i> |
| 475 |
</pre> |
| 476 |
|
| 477 |
</body> |
| 478 |
</section> |
| 479 |
</chapter> |
| 480 |
|
| 481 |
<chapter> |
| 482 |
<title>Resources</title> |
| 483 |
<section> |
| 484 |
<body> |
| 485 |
|
| 486 |
<ul> |
| 487 |
<li> |
| 488 |
The official <uri link="http://sources.redhat.com/lvm2">LVM2 home page</uri> |
| 489 |
</li> |
| 490 |
<li> |
| 491 |
The <uri link="http://tldp.org/HOWTO/LVM-HOWTO">LVM Howto</uri> |
| 492 |
</li> |
| 493 |
<li> |
| 494 |
Daniel Robbins's articles on LVM for IBM's DeveloperWorks: <uri |
| 495 |
link="/doc/en/articles/lvm-p1.xml">Part 1</uri> and <uri |
| 496 |
link="/doc/en/articles/lvm-p2.xml">Part 2</uri> |
| 497 |
</li> |
| 498 |
<li> |
| 499 |
How to boot your root FS off of LVM1: |
| 500 |
<uri>http://www.the-infinite.org/archive/docs/lvm/howto-boot-off-root-lv.txt</uri> |
| 501 |
</li> |
| 502 |
</ul> |
| 503 |
|
| 504 |
</body> |
| 505 |
</section> |
| 506 |
</chapter> |
| 507 |
|
| 508 |
<chapter> |
| 509 |
<title>Acknowledgements</title> |
| 510 |
<section> |
| 511 |
<body> |
| 512 |
|
| 513 |
<p> |
| 514 |
Thanks <mail link="bangert@gentoo.org">Thilo Bangert</mail> and <mail |
| 515 |
link="terjekv@math.uio.no">Terje Kvernes</mail> for their help and comments on |
| 516 |
this document. |
| 517 |
</p> |
| 518 |
|
| 519 |
</body> |
| 520 |
</section> |
| 521 |
</chapter> |
| 522 |
</guide> |
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