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

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[[wikipedia:Logical_Volume_Manager_(Linux)|LVM]]<ref>http://man7.org/linux/man-pages/man8/lvm.8.html</ref> available in Linux allows manage multiple physical volumes or entire hard disks. It supports among other functionalities:
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Logical Volume Manager ([[wikipedia:Logical_Volume_Manager_(Linux)|LVM]])<ref>http://man7.org/linux/man-pages/man8/lvm.8.html</ref> 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
 
* Create single logical volumes of multiple physical volumes or entire hard disks
 
* Add or remove volumes/disk dynamically  
 
* Add or remove volumes/disk dynamically  
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* Create snapshots
 
* Create snapshots
  
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LVM introduces the concept of Volume Groups (VGs) and Logical Volumes (LVs).
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LVM introduces the concept of [[Volume Group]]s (VGs) and [[Logical Volume]]s (LVs).
  
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Configuration file: <code>/etc/lvm/[[lvm.conf]]</code>
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* Configuration file: <code>/etc/lvm/[[lvm.conf]]</code>
  
  
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* List Volume Groups:<code>[[vgs]]</code><ref>http://man7.org/linux/man-pages/man8/vgs.8.html</ref>
 
* List Volume Groups:<code>[[vgs]]</code><ref>http://man7.org/linux/man-pages/man8/vgs.8.html</ref>
 
** <code>[[vgscan]]</code>, <code>[[vgextend]]</code>, <code>[[vgdisplay]]</code>
 
** <code>[[vgscan]]</code>, <code>[[vgextend]]</code>, <code>[[vgdisplay]]</code>
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* List logical volumes: <code>[[lvs]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, [[/lvdisplay/]]
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* List logical volumes: <code>[[lvs]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, [[lvdisplay]]
 
* Resize LV:  
 
* Resize LV:  
 
** <code>[[lvresize]]</code>
 
** <code>[[lvresize]]</code>
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* Ls commands: <code>[[pvs]]</code>, <code>[[lvs]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, <code>[[vgs]]</code>
 
* Ls commands: <code>[[pvs]]</code>, <code>[[lvs]]</code><ref>http://man7.org/linux/man-pages/man8/lvs.8.html</ref>, <code>[[vgs]]</code>
 
* Scan commands: <code>[[pvscan]]</code><ref>http://man7.org/linux/man-pages/man8/pvscan.8.html</ref>, <code>[[vgscan]]</code>
 
* Scan commands: <code>[[pvscan]]</code><ref>http://man7.org/linux/man-pages/man8/pvscan.8.html</ref>, <code>[[vgscan]]</code>
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* PV commands: <code>[[pvdisplay]]</code><ref>http://man7.org/linux/man-pages/man8/pvdisplay.8.html</ref>, <code>pvresize</code>, <code>[[/pvscan/]]</code>, <code>[[pvcreate]]</code> or <code>[[pvcreate]] -vv</code>
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* PV commands: <code>[[pvdisplay]]</code><ref>http://man7.org/linux/man-pages/man8/pvdisplay.8.html</ref>, <code>pvresize</code>, <code>[[pvscan]]</code>, <code>[[pvcreate]]</code> or <code>[[pvcreate]] -vv</code>
 
* LV commands: <code>[[lvcreate]]</code><ref>http://man7.org/linux/man-pages/man8/lvcreate.8.html</ref>, [[lvconvert]]
 
* LV commands: <code>[[lvcreate]]</code><ref>http://man7.org/linux/man-pages/man8/lvcreate.8.html</ref>, [[lvconvert]]
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* VG commands: <code>[[vgdisplay]]</code>, <code>[[vgcreate]]</code>, <code>vgcfgbackup</code>, <code>[[vgscan]]</code>
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* VG commands: <code>[[vgdisplay]]</code>, <code>[[vgcreate]]</code>, <code>[[vgcfgbackup]]</code>, <code>[[vgscan]]</code>
 
* LVM commands: <code>[[lvm dumpconfig]]</code>
 
* LVM commands: <code>[[lvm dumpconfig]]</code>
  
 
=== Advanced commands ===
 
=== Advanced commands ===
 
* <code>lvchange</code><ref>http://man7.org/linux/man-pages/man8/lvchange.8.html</ref> — Change attributes of the Logical Volume Manager.
 
* <code>lvchange</code><ref>http://man7.org/linux/man-pages/man8/lvchange.8.html</ref> — Change attributes of the Logical Volume Manager.
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* <code>[[lvmdiskscan]]</code>. Deprecated: used <code>[[lvs]]</code>. Scan for all devices visible to LVM2.
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* <code>[[lvmdiskscan]]</code>. Deprecated: used <code>[[pvs]]</code>. Scan for all devices visible to LVM2.
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* <code>lvmdump</code> — Create lvm2 information dumps for diagnostic purposes.
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* <code>[[lvmdump]]</code> — Create lvm2 information dumps for diagnostic purposes.
  
 
== Activities ==
 
== Activities ==
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* {{LVM}}
 
* {{LVM}}
 
* [[linux/mdadm|mdadm]] and [[Linux Administration/Devices and Filesystems/ZFS|ZFS]]
 
* [[linux/mdadm|mdadm]] and [[Linux Administration/Devices and Filesystems/ZFS|ZFS]]
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* 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
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* [[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
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* [[DevOps/Ansible|Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module
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* [[Ansible]] LV module: https://docs.ansible.com/ansible/latest/modules/lvol_module.html#lvol-module
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* [[dmsetup]]
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* {{dmsetup}}
 
* [[UUID]]
 
* [[UUID]]
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* {{kpartx}}
  
  

Latest revision as of 10:05, 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[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, 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

  1. ↑ http://man7.org/linux/man-pages/man8/lvm.8.html
  2. ↑ http://man7.org/linux/man-pages/man8/vgs.8.html
  3. ↑ http://man7.org/linux/man-pages/man8/lvs.8.html
  4. ↑ http://man7.org/linux/man-pages/man8/pvdisplay.8.html
  5. ↑ http://man7.org/linux/man-pages/man8/pvcreate.8.html
  6. ↑ http://man7.org/linux/man-pages/man8/lvcreate.8.html
  7. ↑ http://man7.org/linux/man-pages/man8/lvs.8.html
  8. ↑ http://man7.org/linux/man-pages/man8/pvscan.8.html
  9. ↑ http://man7.org/linux/man-pages/man8/pvdisplay.8.html
  10. ↑ http://man7.org/linux/man-pages/man8/lvcreate.8.html
  11. ↑ http://man7.org/linux/man-pages/man8/lvchange.8.html
  12. ↑ https://manpages.debian.org/stretch/e2fsprogs/resize2fs.8.en.html
  13. ↑ https://www.technomenace.com/2014/08/how-to-extend-lvm-on-qcow2-images/
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