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Logical Volume Management (LVM)

Examples

Extending /var XFS filesystem by 127,999 extents with LVM:

1. fdisk /dev/sdb                      # Create partition from new disk.
2. pvcreate /dev/sdb1                  # Create a physical volume from the new partition.
3. vgextend vgname /dev/sdb1           # Add the new physical volume to the relevant volume group.
4. pvdisplay                           # Show the number of new extents available.
5. lvextend -l +127999 /dev/centos/var # Extend the relevant logical volume by adding 127,999 free extents.
6. xfs_growfs /var                     # Grow the filesystem on the extended logical volume.

Physical Volumes (PV)

  • pvdisplay or pvscan = Show physical volumes.
  • pvcreate /dev/sdb = Create a physical volume.
  • pvremove /dev/sdb1 /dev/sdc1 = Remove physical volumes on partitions sdb1 and sdc1.
  • pvmove /dev/sdb1 /dev/sdb2 = Copy all data from sdb1 to sdb2.

Logical Volumes (LV)

  • lvdisplay or lvscan = Show logical volumes.
  • lvcreate -l 2500 centos -n vol_1 = Create a new volume called vol_1 with 2500 extents in vgroup centos.
  • lvextend -L 1.5G /dev/mapper/LV1 = Extend volume LV1 to 1.5 GB.
  • lvreduce -l -200 /dev/mapper/LV1 = Reduce volume LV1 by 200 extents.

Volume Groups (VG)

  • vgdisplay or vgscan = Show volume groups.
  • vgcreate VG1 /dev/sdb1 /dev/sdc1 = Create a volume group called VG1, containing physical volumes sdb1 and sdc1.
  • vgextend VG1 /dev/sdb1 = Add physical volume sdb1 to volume group VG1.