Logical Volume Manager (Linux)

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Logical Volume Manager (LVM)[1] available in Linux allows manage multiple physical volumes or entire hard disks. It supports among other functionalities:

  • Create single logical volumes of multiple physical volumes or entire hard disks
  • Add or remove volumes/disk dynamically
  • Increase or decrease size of Logical Volumes (LVs)
  • Create snapshots

LVM introduces the concept of Volume Groups (VGs) and Logical Volumes (LVs).


Components[edit]

Basic commands[edit]

  • Display commands:
pvdisplay[4]
lvdisplay
vgdisplay
  • Create commands:
pvcreate[5]
lvcreate[6]
vgcreate
vgreduce

Advanced commands[edit]

  • lvchange[11] — Change attributes of the Logical Volume Manager.
  • lvmdiskscan. Deprecated: used pvs. Scan for all devices visible to LVM2.
  • lvmdump — Create lvm2 information dumps for diagnostic purposes.

Activities[edit]

Basic[edit]

  1. Read StackOverflow LVMs questions: https://superuser.com/questions/tagged/lvm?tab=Votes
  2. Read Configuring and Managing Logical Volumens in RHEL 8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_logical_volumes/index
  3. Configure an LVM Volume with an ext File Sytem: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/high_availability_add-on_administration/s1-lvmsetupnfs-haaa

Advanced[edit]

Before doing these exercises make your you have a backup of your data.

  1. Convert a Linear Device to a RAID device: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_logical_volumes/index#proc_converting-linear-to-raid-configure-manage-raid
  2. Read LVM Changelog: sourceware.org/git/?p=lvm2.git;a=blame;f=WHATS_NEW;hb=9cad26be321844868a904c7b07bebe37be4e0169

See also[edit]

scan: pvscan vgscan
LVM: lvs lvmscan lvm fullreport lvmreport lvmconfig lvmdump lvmcheck lvm dumpconfig
Scan: pvs vgs lvs pvscan vgscan
PV: pvcreate pvremove pvscan pvremove pvscan pvs pvchange pvck pvdisplay pvresize
LV: lvdisplay lvcreate lvremove, lvresize, lvextend, lvrename, lvreduce
VG: vgdisplay,vgcreate, vgreduce,vgremove, vgextend, vgscan, vgchange, vgrename, vgcfgbackup, vgcfgrestore, vgimportclone, vgck
Check commands: pvck vgck


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Original Source: https://en.wikiversity.org/wiki/Linux_Administration/Devices_and_Filesystems/LVM