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LVM: Logical Volume Manager

LVM

Flexible Capacity:

  • You can create file systems that extend across multiple storage devices.
  • You can aggregate multiple storage devices into a single logical volume.

Easily Resize Storage While Online:

  • Expand or shrink file systems in real-time while the data remains online and fully accessible.

Online Data Relocation:

  • Easily migrate data from one storage device to another while online.

Convenient Device Naming:

  • You can use human-readable device names of your choosing. /dev/vg_database/lv_db_logs vs /dev/sdb3

Linux Disk Striping:

  • Increase throughput by allowing your system to read data in parallel.

Snapshots:

  • Create point-in-time snapshots of your filesystems.

Logical Volume Creation Process:

  • Create one or more physical volumes.
  • Create a volume group from those one or more physical volumes.
  • Create one or more logical volumes from the volume group.

LVM Summary:

  • Logical Volume Manager introduces layers of abstraction including:
  • Physical Volumes (PVs)
  • Volume Groups (VGs)
  • Logical Volumes (LVs)

LVM Summary – Creating LVs:

pvcreate /dev/sdb
vgcreate vg_name /dev/sdb
lvcreate -L 100G -n lv_name vg_name
mkfs -t ext4 /dev/vg_name/lv_name

LVM Summary – Extending LVs:

lvextend -L +10G -r /dev/vg_name/lv_name
pvcreate /dev/sdc
vgextend vg_name /dev/sdc

LVM Summary – Mirrored LVs:

lvcreate -m 1 -L 100G -n lv_name vg_name 

LVM Summary – Removing LVs:

lvremove /dev/vg_name/lv_name
vgreduce vg_name /dev/sdb
vgremove vg_name
pvremove /dev/sdb

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