LVM (Logical Volume Manager)

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∟LVM (Logical Volume Manager)

This chapter provides introductions and tutorial on LVM (Logical Volume Manager). Topics include introduction to LVM components: PV (Physical Volume), VG (Volume Group), LV (Logical Volume); creating and managing PV, VG, LV; extending file systems on LVs on the fly.

What Is LVM (Logical Volume Manager)

Create New PV (Physical Volume)

Add/Remove PV on VG on the Fly

Create LV on VG on the Fly

Extend /home LV with a New Partition

Takeaways:

LVM (Logical Volume Manager) is a storage manager that allows you to create a single or multiple logical storage volumes across multiple physical disks or partitions.
PV (Physical Volume) represents a single physical hard disk, or a partition of a hard disk, to be managed by the LVM.
VG (Volume Group) represents a virtual storage device made up by one or more PVs and managed by the LVM.
LV (Logical Volume) represents a virtual storage partition in a VG managed by the LVM (Logical Volume Manager).
A file system on a LV can be easily extended on the fly to take additional storage spaces from the VG.
"lvm" is the command line tool to manage LVM's PVs, VGs and LVs.
"pvs" or "pvdisplay" commands can be used to display PV information.
"vgs" or "vgdisplay" commands can be used to display VG information.
"lvs" or "lvdisplay" commands can be used to display LV information.
"pvcreate", "vgcreate" and "lvcreate" commands can be used to create PVs, VGs, and LVs.
"vgextend" and "lvextend" commands can be used to extend storage space of VGs and LVs.
"resize2fs" command can be used to extend ext2/3/4 file systems.
"xfs_growfs" command can be used to extend xfs file systems.