tour - touring some programming systems

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*	*	elioat	2023-11-17	1	-0/+66
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        <h1>LVM</h1>

        <p>Read <a href="https://raid.wiki.kernel.org/index.php/RAID_setup">Raid Setup</a>,
        the only thing you will need outside system is:
        "Patience, Pizza, and your favorite caffeinated beverage.".
        <a href="https://wiki.archlinux.org/index.php/Software_RAID_and_LVM">Arch Wiki</a>
        article about Sofware RAID and LVM.</p>

        <p>Basic idea behind RAID is to deal with independent disks
        as an array of drives. Raid 0 uses two or more disks as one,
        with performance gains without fault-tolerance. From raid 1
        to 6 they offer diferent fault tolerance mechanisms.</p>

        <p>LVM or Logic Volume Manager bring one more layer, read
        <a href="http://www.tuxradar.com/content/lvm-made-easy">Lvm made easy</a>.
        Partitions under lvm are easy to be resized, moved and there is
        a tool to help encrypt. There is more freedom to name physical
        disk names exp; production, development, backups...</p>


        <p>Until now "from install" there is only one partition,
        it is good idea to have a system with diferent partitions for each
        propos. If is a "fresh install";</p>

        <pre>
        # cd /iso/crux/opt/
        # pkgadd lvm2#2.02.107-1.pkg.tar.xz
        #
        </pre>

        <h2 id="lvmpart">1. LVM Partition</h2>

        <p>Create a LVM partition, fdisk should
        show something like this;</p>

        <pre>
        # parted /dev/sda
        </pre>

        <p>I use defaults unless to define system partition last sector,
        where in this example is size, +80G</p>


        <h2 id="pv">2. Create physical volume</h2>

        <pre>
         # pvcreate /dev/sdb3
          Physical volume "/dev/sdb3" successfully created
        </pre>

        <h2 id="vg">3. Create volume group</h2>

        <pre>
        # vgcreate vg_system /dev/sdb3
          Volume group "vg_system" successfully created
        # vgcreate homevg /dev/sdb4
          Volume group "homevg" successfully created
        #
        </pre>

        <h3>3.1. Search Volume Groups</h3>

        <pre>
        # vgscan
          Reading all physical volumes.  This may take a while...
          Found volume group "homevg" using metadata type lvm2
          Found volume group "vg_system" using metadata type lvm2
        #
        </pre>

        <h2 id="lv">4. Create logical volume</h2>

        <pre>
        # lvcreate -L 15G -n distfileslv vg_system
          Logical volume "distfileslv" created.
        # lvcreate -L 8G -n packageslv vg_system
          Logical volume "packageslv" created.
        # lvcreate -L 4G -n swaplv vg_system
          Logical volume "swaplv" created.
        # lvcreate -L 80G -n homelv homevg
          Logical volume "homelv" created.
        #
        </pre>

        <pre>
        # mkfs.ext4 /dev/vg_system/distfileslv
        # mkfs.ext4 /dev/vg_system/packageslv
        # mkswap /dev/vg_system/swaplv
        # mkfs.ext4 /dev/homevg/homelv
        </pre>

        <h3>4.1. Activate Deactivate</h3>

        <p>Deactivate logical volumes;</p>

        <pre>
        # lvchange -a -n /dev/vg_system/packageslv
        # lvchange -a -n /dev/vg_system/distfileslv
        # swapoff /dev/vg_system/sawplv
        # lvchange -a -n /dev/vg_system/swaplv
        </pre>

        <p>Deactivate volume group;</p>

        <pre>
         # vgchange -a n vg_system
         0 logical volume(s) in volume group "vg_system" now active
         #
        </pre>

        <p>Activate volume group;</p>
        <pre>
        # vgchange -a y vg_system
          3 logical volume(s) in volume group "vg_system" now active
        #
        </pre>

        <h2 id="maint">5. Maintenance</h2>

        <h2 id="encrypt">7. Encryption</h2>

        <a href="index.html">Tools Index</a>
        <p>
        This is part of the c9-doc Manual.
        Copyright (C) 2016
        c9 team.
        See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
        for copying conditions.</p>
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