Linux Logical Volume Management Operations: Difference between revisions

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=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=
=Internal=


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

Latest revision as of 23:20, 13 February 2018

External

Internal

Overview

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

lvm> lvs

produces identical results to 

lvs

Inventory of Devices that May Be Used as Physical Volumes

lvmdiskscan

Example: 

[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

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) 

lvmdiskscan -l

LVM Configuration

Physical Volume Operations

Physical Volume Concepts

Information about Physical Volumes

  • pvs - provides information about physical volumes available on the system.
  • pvscan - scans all disks for physical volumes.
  • pvdisplay - provides details about a specific physical volume.

Physical Volume Management Operations

  • 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

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.
  • 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

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

Procedures

Troubleshooting

  • View LVM logs:
journalctl -u dm-event.service
  • Block devices:
lsblk
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