LVM functions by layering abstractions on top of physical storage devices. The basic layers that LVM uses, starting with the most primitive, are.
- Description: Physical block devices or other disk-like devices (for example, other devices created by device mapper, like RAID arrays) are used by LVM as the raw building material for higher levels of abstraction. Physical volumes are regular storage devices. LVM writes a header to the device to allocate it for management.
- Description: LVM combines physical volumes into storage pools known as volume groups. Volume groups abstract the characteristics of the underlying devices and function as a unified logical device with combined storage capacity of the component physical volumes.
- Description: A volume group can be sliced up into any number of logical volumes. Logical volumes are functionally equivalent to partitions on a physical disk, but with much more flexibility. Logical volumes are the primary component that users and applications will interact with.
Create a volume group
pvcreate /dev/sda1 /dev/sdb1 vgcreate vol_group_name /dev/sda1 /dev/sdb1 lvcreate -l 100%FREE -n drive_name vol_group_name
View info on group
pvscan pvdisplay vgdisplay lvdisplay
Mount Hidden LVM (Perfect for rescue env)
pvscan vgscan vgchange -ay lvscan mount /dev/VolGroup00/LogVol00 /mnt
Grow XFS/EXT4 GPT LVM
Create new partition
GDisk n – Create a new partition Verify partition start Verify partition end 8E00 – Set the partition type to Linux LVM w – Write the changes to disk
Set new partition as LVM
Extend volume group
vgextend <volumeGroupName> /dev/<partitionDeviceName>
lvextend -l +100%FREE /dev/<volumeGroupName>/<logicalVolumeName>