Difference between revisions of "Logical Volume Manager (Linux)"

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* [[linux/mdadm|mdadm]] and [[Linux Administration/Devices and Filesystems/ZFS|ZFS]]
 
* [[linux/mdadm|mdadm]] and [[Linux Administration/Devices and Filesystems/ZFS|ZFS]]
 
* [[resize2fs]]<ref>https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html</ref> file system resizer  for ext2/ext3/ext4 (resize2fs /dev/mapper/VolGroup-lv_root) (for ext4 only).<ref>https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/</ref>. Code: https://github.com/tytso/e2fsprogs/blob/master/resize/resize2fs.c
 
* [[resize2fs]]<ref>https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html</ref> file system resizer  for ext2/ext3/ext4 (resize2fs /dev/mapper/VolGroup-lv_root) (for ext4 only).<ref>https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/</ref>. Code: https://github.com/tytso/e2fsprogs/blob/master/resize/resize2fs.c
* [[DevOps/Ansible|Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module
+
* [[Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module
* [[dmsetup]]
+
* {{dmsetup}}
 
* [[UUID]]
 
* [[UUID]]
  

Revision as of 09:59, 20 September 2020

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

Basic commands

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

Advanced commands

  • 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

Basic

  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

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

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


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

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