30.2 Getting Information about Logical Volumes
As an example of using LVM with RHEL 8 we will work through an example of adding space to the / file system of a standard RHEL 8 installation. Anticipating the need for flexibility in the sizing of the root partition, RHEL 8 sets up the / file system as a logical volume (called root) within a volume group called rhel. Before making any changes to the LVM setup, however, it is important to first gather information.
Running the mount command will output information about a range of mount points, including the following entry for the root filesystem:
/dev/mapper/rhel-root on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
Information about the volume group can be obtained using the vgdisplay command:
# vgdisplay
--- Volume group ---
VG Name rhel
System ID
Format lvm2
Metadata Areas 1
...