Linux Logical Volume Management Operations
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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
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
- lvmconfig - displays LVM configuration.
Physical Volume Operations
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
Information about 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
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
- lvcreate - creates a logical volume in an existing volume group.
- lvresize - resize a logical volume.
- lvrename
- lvchange
- lvremove - removes a logical volume from a volume group.
Procedures
- Provisioning and Installing a New Filesystem on a New Logical Volume
- Shringking a File System on a Logical Volume
- Logical Volume Management and Virtualization
- Provision Thin Pool Strorage for Docker on a Dedicated Block Device
Troubleshooting
- View LVM logs:
journalctl -u dm-event.service
- Block devices:
lsblk