lvm.rst
author Oleksandr Gavenko <gavenkoa@gmail.com>
Mon, 22 Feb 2016 12:46:36 +0200
changeset 1905 fba288d59662
child 1912 8b81a8f0f692
permissions -rw-r--r--
Include only local subsections into TOC. This prevent duplication of TOC when build single page HTML document. Also this make unnecessary CSS hack to hide document title as top level section.
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.. -*- coding: utf-8; -*-
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.. include:: HEADER.rst
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=====
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 LVM
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=====
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.. contents::
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   :local:
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Debian package
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==============
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::
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  $ sudo apt-get install lvm
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List partitions
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===============
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::
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  $ sudo sfdisk -l
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or use gparted(1).
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Setup physical volume
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=====================
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::
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  $ sudo pvcreate /dev/sdc3
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  Physical volume "/dev/sdc3" successfully created
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Setup volume group
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==================
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::
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  $ sudo vgcreate vg0 /dev/sdc3
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  Volume group "vg0" successfully created
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Show info about volume group
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============================
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::
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  $ sudo vgdisplay
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  --- Volume group ---
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  VG Name               vg0
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  System ID
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  Format                lvm2
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  Metadata Areas        1
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  Metadata Sequence No  1
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  VG Access             read/write
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  VG Status             resizable
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  MAX LV                0
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  Cur LV                0
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  Open LV               0
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  Max PV                0
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  Cur PV                1
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  Act PV                1
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  VG Size               77.22 GB
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  PE Size               4.00 MB
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  Total PE              19769
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  Alloc PE / Size       0 / 0
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  Free  PE / Size       19769 / 77.22 GB
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  VG UUID               ZOQvrP-PnJ2-kKsH-7aLU-eOa3-K5M2-sRstJH
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Create logical volume
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=====================
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::
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  $ sudo lvcreate -L 10G -n home vg0
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  Logical volume "home" created
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Show info about logical volume
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==============================
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::
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  $ sudo lvdisplay
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  --- Logical volume ---
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  LV Name                /dev/vg0/home
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  VG Name                vg0
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  LV UUID                XWJFnF-LjQg-Xsvm-IeQI-68mX-jiYd-pSpA00
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  LV Write Access        read/write
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  LV Status              available
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  # open                 1
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  LV Size                20.00 GB
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  Current LE             5120
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  Segments               1
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  Allocation             inherit
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  Read ahead sectors     0
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  Block device           254:0
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  --- Logical volume ---
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  LV Name                /dev/vg0/swap
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  VG Name                vg0
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  LV UUID                BHBQd0-1RlO-hHn7-jAij-Gyg6-KnqE-lRBgPY
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  LV Write Access        read/write
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  LV Status              available
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  # open                 1
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  LV Size                1.00 GB
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  Current LE             256
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  Segments               1
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  Allocation             inherit
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  Read ahead sectors     0
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  Block device           254:1
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Create fs on logical volume
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===========================
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::
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  $  sudo mke2fs -j /dev/vg0/home
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  mke2fs 1.40-WIP (14-Nov-2006)
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  Filesystem label=
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  OS type: Linux
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  Block size=4096 (log=2)
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  Fragment size=4096 (log=2)
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  1310720 inodes, 2621440 blocks
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  131072 blocks (5.00%) reserved for the super user
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  First data block=0
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  Maximum filesystem blocks=2684354560
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  80 block groups
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  32768 blocks per group, 32768 fragments per group
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  16384 inodes per group
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  Superblock backups stored on blocks:
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          32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
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  Writing inode tables: done
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  Creating journal (32768 blocks): done
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  Writing superblocks and filesystem accounting information: done
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Remove logical volume
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=====================
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::
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  $ sudo lvremove  /dev/vg0/home
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Move home dir to lvm
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====================
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::
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  $ su
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  ...
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  $ mv /home /home2
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  $ lvcreate -L 10G -n home vg0
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  $ mke2fs -j /dev/vg0/home
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  $ emacs /etc/fstab
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  ...
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  $ cat /etc/fstab
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  ...
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  /dev/vg0/home   /home  ext3  defaults  0  2
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  ...
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  $ mount -a
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  $ (cd /home2; tar -cf - .) | (cd /home; tar -xpf -)
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  $ rm -r /home2
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Creating swap on lvm
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====================
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::
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  $ su
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  ...
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  $ lvcreate -L 1G -n swap vg0
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  $ mkswap -v1 /dev/vg0/swap
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  $ emacs /etc/fstab
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  ...
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  $ cat /etc/fstab
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  ...
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  /dev/vg0/swap   swap  swap  defaults  0  0
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  ...
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  $ swapon -a
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