Intro

Requirements:

  • To use lvm we require a partition or entire disk (we will go with partitions).
  • Use fdsik or similar kind of program to partition your disk.

Steps:

  • Create physical volumes from disk partitions
  • Create volume groups from physical volumes
  • Create logical volumes from volume groups

Physical Volumes:

Listing Volumes:

   PV         VG      Fmt  Attr PSize   PFree   DevSize PV UUID
   /dev/sda3  dev lvm2 a--  100.00m 100.00m 102.10m K0W4kZ-gqDT-EFXj-sWta-xYG2-Pkp2-2gBpr1

Output:

  • PV - Partition/Device name of Physical volume.
  • VG - Name of volume group.
  • Fmt - Format of physical volume.
  • Attr - (a) allocatable, (x) exported.
  • PSize - Total physical volume size.
  • PFree - Total physical volume free space available.
  • DevSize - Device/Partion size.
  • PV UUID - Unique identifier for physical volume.

Commonly used options:

  • -o - Stands for options, it can list many options, see pvs -o -h.
  • --separator - To separate each column.
  • --segments - Shows starting segment and length of segment (unit is physical extends).

Create Volumes:

   pvcreate <partion_or_device_name>
   pvcreate /dev/sda3

Commonly used options:

  • --uuid - Provide a unique identifier.
  • -M2 - Create a LVM2 format physical volume.
    • This is displayed by pvs output field Fmt.
  • --metadatasize - Padding size for each metadata.
  • --pvmetadatacopies - Number of metadata to be set aside on each physical volume.
  • --setphysicalvolumesize - Set a physical volume size.

Remove Volumes:

   pvremove <partion_or_device_name>
   pvremove /dev/sda3

Resize Volumes:

   pvresize <partion_or_device_name>
   pvresize /dev/sda3

Scan Volumes:

   pvscan

Move Volumes:

   pvmove <partion_or_device_name>
   pvmove /dev/sda3 /dev/sda4

Volume Groups:

Listing Volumes:

   VG      Attr   Ext   #PV #LV #SN VSize   VFree   VG UUID                                VProfile
   dev wz--n- 4.00m   1   0   0 100.00m 100.00m 5gx2Ug-2TjU-t1YF-eTpe-ruRq-60OL-4Hpn5l

Output:

  • VG - Name of the volume group.
  • Attr - Attribute options are as follows:
    • permissions (r)|(w)
    • resi(z)eable
    • e(x)ported
    • (p)artial
    • allocation policy - (c)ontiguous, c(l)ing, (n)ormal, (a)nywhere, (i)nherited
    • (c)luster
  • #PV - Number of physical volumes.
  • #LV - Number of logical volumes.
  • VSize - Total size of volume group.
  • VFree - Total free space on volume group.
  • VG UUID - Unique identifier for volume group.

Commonly used options:

  • -o - Stands for options, it can list many options, see vgs -o -h.
  • --separator - To separate each column.

Create Volumes:

   vgcreate <group_name> <partion_or_device_name>
   vgcreate dev /dev/sda3

Commonly used options:

  • -l - Set maximum logical volumes.
  • -p - Set maximum physical volumes.
  • -s - Set physical extent size (default is 4MB).
  • -A - Autobackup.

Remove Volumes:

   vgremove <group_name>
   vgremove dev

Extend Volumes:

   vgextend <group_name> <partion_or_device_name>
   vgextend dev /dev/sda4

Reduce Volumes:

   vgreduce <group_name> <partion_or_device_name>
   vgreduce dev /dev/sda4

Rename Volumes:

   vgrename <group_name> <new_group_name>
   vgrename dev devops

Merge Volumes:

   vgmerge <new_group> <old_group>
   vgmerge devops dev

Split Volumes:

   vgsplit <old_group> <new_group>
   vgsplit dev devops

Scan Volumes:

   vgscan

Logical Volumes:

Listing Volumes:

   LV    VG      Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
   qa   dev -wi-a----- 12.00m

Output:

  • LV - Name of logical volume.
  • VG - Name of volume group.

  • Attr - Attribute options are as follows:

    • volume type: (m)irrored, (M)irrored without initail sync, (o)rigin, (p)vmove, (s)napshot, invalid (S)napshot, (v)irtual, mirror (i)mage, mirror (I)mage out-of-sync, under (c)onversion
    • permissions: (w)rite, (r)ead-only
    • allocation policy - (c)ontiguous, c(l)ing, (n)ormal, (a)nywhere, (i)nherited
    • fixed (m)inor
    • state: (a)ctive, (s)uspended, (I)nvalid snapshot, invalid (S)uspended snapshot, mapped (d)evice present with-out tables, mapped device present with (i)nactive table
    • device (o)pen (mounted in other words)
      • LSize - Total size of logical volume.

    Commonly used options:

  • -o - Stands for options, it can list many options, see lvs -o -h.
  • --separator - To separate each column.
  • --segments - Shows starting segment and length of segment (unit is physical extends).

Create Volumes:

   lvcreate <volume_name> <group_name>
   lvcreate -L 10M -n qa dev

Commonly used options:

  • -L - Size of the volume [kKmMgGtT]
  • -l - Number of extents
  • -C - Contiguous [y|n]
  • -i - Stripes
  • -I - Stripe size
  • -m - Mirrors
  • -n - Volume name

Remove Volumes:

   lvremove <group_name> <volume_name>
   lvremove dev qa

Extend Volumes:

   lvextend <group_name> <volume_name>
   lvextend -L 10M dev qa

Commonly used options:

  • -L - Size of the volume [kKmMgGtT]
  • -l - Number of extents
  • -C - Contiguous [y|n]
  • -i - Stripes
  • -I - Stripe size

Reduce Volumes:

   lvreduce <group_name> <volume_name>
   lvreduce -L 5M dev qa

Resize Volumes:

   lvresize <group_name> <volume_name>
   lvresize -L 5M dev qa

Scan Volumes:

   lvscan

Rename Volumes:

   lvrename <old_volume_name> <new_volume_name>
   lvrename qa development

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