View source for Lvm

==Create partition.==
 fdisk /dev/sda1
 n
 t
 Partition type 8e

==Create physiscal volume.==
 pvcreate /dev/sda3
 pvdisplay

==Create volume group.==
 vgcreate VolGroup00 /dev/sda1
 vgdisplay

==create logical volume==
Create logical volume. Create a logic volume spanning 3 disks, each stripe 256kb, 1,5TB, called LogVol00 in VolGroup00
 lvcreate -i3 -I 256 -L1500000 -n LogVol00 VolGroup00
 lvcreate  -L 5.12G -n LogVol02 VolGroup00 # Create logical volume of 5.12G on Volume group VolGroup00.
 lvcreate --name apps --size 30G vg0
==list volume groups==
 lvdisplay

==Format logical volume.==
 mkfs.reiserfs /dev/VolGroup00/LogVol02

==Extend a resizerfs logical volume.==
 lvextend -L+70G /dev/VolGroup00/LogVol00
 resize_reiserfs -f /dev/VolGroup00/LogVol00

==Extend a ext3 partition.==
 lvextend -L +6g /dev/vgroot/root.fs
 resize2fs /dev/vgroot/root.fs

==Shrink ext2/3 partition.==
 umount /data # umount /data
 resize2fs /dev/VolGroup00/LogVol00 10G # Resize file system to 10GB.
 lvreduce -L 10G /dev/VolGroup00/LogVol00 # Resize logical volume to 1GB.
 e2fsck -f /dev/VolGroup00/LogVol00 # Check filesystem.
 mount /data # mount /data

==Shrink reizerfs volume. (not tested yet)==
 umount /data # unmount /data
 resize_reiserfs -s 10G /dev/VolGroup00/LogVol00 # Resize file system to 10GB.
 lvreduce -L 10G /dev/VolGroup00/LogVol00 # Resize logical volume to 1GB.
 vgreduce vg0 /dev/vdb1
 mount -t reiserfs /data

 resize_reiserfs -s-150M /dev/VolGroup/LogVol00
 lvreduce -L-150M /dev/VolGroup00/LogVol00

==Create device-mapper in /proc/misc==
 modprobe dm-mod

==Activate Volume Group.==
 lvm vgchange -a y VolGroup00

==Create a snapshot volume.==
 modprobe dm-snapshot
 lvcreate --snapshot --size 128M --name LogVol02snap /dev/VolGroup00/LogVol02

==Create device maps from partition tables==
 kpartx -av /dev/VolGroup00/LogVol02

==Copy logical volume.==
 dd if=/dev/VolGroup00/LogVol02 of=/dev/VolGroup00/LogVol03 bs=64M

==Extend logical volume with disk.==
 vgextend vgroot /dev/sdb

==Check for Free PE / Size. First we need to enlarge the logical volume.==
 vgdisplay

==Now we enlarged the volume but not the filesystem.==
 lvextend -l +<number of extents> /dev/<volume group>/<logical volume>

==This will grow the filesystem on-line.==
 resize2fs /dev/<volume group>/<logical volume>

==When extending partition by deleting and adding partition.==
 pvchange -x /dec/sda
==Logical volume information==
 lvs
You should see more than the standard disks.
  LV        VG        Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  lvdata287 vgdata287 -wi--- 500.00G                                    
  lvdata306 vgdata306 -wi---  50.00G                                    
  lvdata370 vgdata370 -wi---  20.00G                                    
  lvdata371 vgdata371 -wi--- 600.00G                                    
  lvlog287  vglog287  -wi--- 100.00G                                    
  lvlog306  vglog306  -wi---  20.00G                                    
  lvlog370  vglog370  -wi---  10.00G                                    
  lvlog371  vglog371  -wi---  20.00G                                    
  opt.fs    vgroot    -wi-ao  12.00G                                    
  root.fs   vgroot    -wi-ao   4.00G                                    
  swap.vol  vgroot    -wi-ao   2.00G                                    
  var.fs    vgroot    -wi-ao   8.00G

==remove a pv==
 lvremove vg2
 vgremove vg2
 pvscan
 pvremove /dev/xvdg
==remove logical volume and volume group when disk has been removed==
 dmsetup info
 dmsetup remove vg04-vz
==vgs==
Look to see if there is any available space.
 vgs

==lvs==
Display information about logical volumes
 lvs
Type and stripes
 lvs -o+lv_layout,stripes
 lvs -a -o+lv_layout,lv_role,stripes,devices

==add snapshot volume==
 lvcreate -n root_SNAP -s vg0/root -L 1500M
==remove snapshot volume==
 lvremove -f  /dev/vg0/root_SNAP
=pvresize=
Increase size of pv.
 pvresize /dev/sdc
=pvs=
 List usage of pv
[[Category:Applications]]
[[Category:Unix]]
[[Category:Storage]]