View source for Linux Logical Volume Management Operations

=External=

* https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Logical_Volume_Manager_Administration/index.html
* https://www.howtogeek.com/howto/40702/how-to-manage-and-use-lvm-logical-volume-management-in-ubuntu/
* Step by step guide of using LVM with loopback devices https://ops.tips/blog/lvm-on-loopback-devices/

=Internal=

* [[Linux Logical Volume Management#Subjects|Logical Volume Management]]

=Overview=

Logical volume management commands can be issued from the <tt>lvm</tt> console, or as standalone commands. For example:

<pre>
lvm> lvs
</pre>

produces identical results to

<pre>
lvs
</pre>

=Inventory of Devices that May Be Used as Physical Volumes=

<pre>
lvmdiskscan
</pre>

Example:

<pre>
[root@rhel-test ~]# lvmdiskscan
  /dev/rhel_rhel-test/swap [     820.00 MiB] 
  /dev/sda1                [     500.00 MiB] 
  /dev/rhel_rhel-test/root [       6.67 GiB] 
  /dev/sda2                [       7.51 GiB] LVM physical volume
  /dev/sdb                 [       2.00 GiB] 
  3 disks
  1 partition
  0 LVM physical volume whole disks
  1 LVM physical volume
</pre>

The output specifies which device is already a LVM Physical Volume

To see only the existing Physical Volumes (devices that have Volume Groups on them) 

<pre>
lvmdiskscan -l
</pre>

=LVM Configuration=

* [[lvmconfig]] - displays LVM configuration.

=Physical Volume Operations=

{{Internal|Linux_Logical_Volume_Management_Concepts#Physical_Volumes_.28PVs.29|Physical Volume Concepts}}

==Information about Physical Volumes==

* <span id='Inventory_of_Physical_Volumes'></span>[[pvs]] - provides information about physical volumes available on the system.
* [[pvscan]] - scans all disks for physical volumes.
* <span id='Details_about_a_Specific_Physical_Volume'></span>[[pvdisplay]] - provides details about a specific physical volume.

==Physical Volume Management Operations==

* [[pvcreate#Initialize_Partition_for_use_by_LVM|pvcreate]] - initializes a physical volume(s) for use by LVM.
* [[pvchange]] - changes attributes of a physical volume.
* [[pvresize]] - resizes a disk or partition in use.
* [[pvmove]] - moves physical extents from one physical volume to another.
* [[pvck]] - checks the consistency of the physical volume metadata.
* [[pvremove]] - removes a physical volume.

=Volume Group Operations=

{{Internal|Linux_Logical_Volume_Management_Concepts#Volume_Group_.28VG.29|Volume Group Concepts}}

==Information about Volume Groups==

* [[vgs]] - reports information about volume groups.
* [[vgdisplay]] - display attributes of volume groups.

==Volume Group Management Operations==

* [[vgcreate]] - create a volume group.
* <span id='Adding_Physical_Volumes_to_a_Volume_Group'></span>[[vgextend#Add_Physical_Volumes_to_a_Volume_Group|vgextend]] - add Physical Volumes to a Volume Group.
* [[vgreduce]] - removes one or more unused physical volumes from a volume group.
* [[vgremove]] - deletes a volume group.

=Logical Volume Operations=

{{Internal|Linux_Logical_Volume_Management_Concepts#Logical_Volume_.28LV.29|Logical Volume}}

==Information about Logical Volumes==

* [[lvs]] - provides information about logical volumes available on the system.
* [[lvdisplay]] - displays attributes of a logical volume.
* [[lvscan]] - scans all known volume groups or all supported LVM block devices in the system for defined Logical Volumes.

==Logical Volume Management Operations==

* <span id='Creating_a_Logical_Volume'></span>[[lvcreate]] - creates a logical volume in an existing volume group.
* <span id='Extending_a_Logical_Volume'></span>[[lvresize]] - resize a logical volume.
* <span id='Renaming_a_Logical_Volume'>[[lvrename]]
* [[lvchange]]
* <span id='Remove_a_Logical_Volume'><span id='Removing_a_Logical_Volume'>[[lvremove]] - removes a logical volume from a volume group.

=Procedures=

* [[Provisioning and Installing a New Filesystem on a New Logical Volume]]
* <span id='Shrinking_the_Filesystem_and_the_Logical_Volume'></span>[[Shringking a File System on a Logical Volume]]
* <span id='Shrinking_a_Logical_Volume_used_by_a_xen_Virtual_Machine'></span>[[Logical Volume Management and Virtualization|Logical Volume Management and Virtualization]]
* [[Provision Docker Storage on a Dedicated Block Device|Provision Thin Pool Strorage for Docker on a Dedicated Block Device]]

=Troubleshooting=

* View LVM logs:

 journalctl -u dm-event.service

* Block devices:

 [[lsblk]]