Logical Volume Manager (Linux)

From wikieduonline
Revision as of 08:35, 15 December 2019 by Welcome (talk | contribs) (→‎See also)
Jump to navigation Jump to search

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).

Configuration file: /etc/lvm/lvm.conf


Basic commands

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

Advanced commands

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

Activities

Basic

  1. Read StackOverflow LVMs questions: https://superuser.com/questions/tagged/lvm?tab=Votes
  2. 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

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

See also

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, lvreduce, lvrename
VG: vgdisplay,vgcreate,vgremove, vgextend, vgreduce, vgscan, vgchange, vgrename, vgcfgbackup, vgcfgrestore, vgimportclone, vgck
Check commands: pvck vgck


Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy.

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

Advertising: