LVM (Logical Volume Management)

• Combine disk together by software

• Add new HDD on the fly to extend disk space

• Set LVM in Linux install

• Desired capacity: all → set last partition to space left

• /boot → 500 MB LVM ⚠ always

• fdisk /dev/sdc

  • n → new partition
  • t → change partition system ID
  • 8e → change to Linux LVM

• pvcreate /dev/sdc1 → create physical volume

• pvdisplay → infos

• vgcreate vg /dev/sdc1 → create volume group

• vgdisplay → show info

• lvcreate -n lv --size 500 vg

• lvdisplay → show info

• mkfs.xfs /dev/vg/lv → format logical volume

Extend LVM → create LVM partition

• pvcreate /dev/sd01
• vgextend vg /dev/sd01
• lvextend -L +100M /dev/mapper/vg-vg
• xfs_growfs /dev/mapper/vg-vg

Add / Extend Swap Space

• System will not boot if set incorrect

• Recommended: 2x size of RAM

• dd if=/dev/zero of=/newswap bs=1M count=1024

  • Extract disk space from HDD to swap

• chmod go-r /newswap

  • Make file non-readable for others

• mkswap /newswap

  • Make swap file

• swapon /newswap

  • Activate swap (add with the rest)

• nano fstab

/newswap swap swap defaults 0 0

xfs_info → display detailed information

• xfs_info /dev/mapper/cs-root
  • Debug info about main XFS partition