Linux: Logical Volume Manager (LVM)

• Drive naming convention
  • /dev/sda
  • /dev/sda1
  • /dev/sdb
  • /dev/sdb3
• List available physical drives:
  • fdisk -l
• Create a partition
  • fdisk /dev/sdb
  • n - Create new partition
  • p - primary partition
    • When done press "p" for a list
  • w - write the changes
• Reboot or execute "partprobe"
• If install was a minimal install
  • yum install lvm2
• Create physical volumes
  • pvcreate /dev/sdb1 /dev/sdc1
• Verify creation
  • pvdisplay or pvs
• Create a volume group
  • vgcreate vg1 /dev/sdb1 /dev/sdc1
  • vgdisplay or vgs
• Create logical volumes
  • lvcreate -L <size> vg1 -n <name>
  • lvcreate -L 250G vg1 -n website
• Format and mount the logical volume
  • mkfs.ext4 /dev/vg1/website
  • mkdir /website
  • mount /dev/vg1/website /website
  • semanage fcontext -a -t httpd_sys_content_t /website
  • restorecon /website
• Add more storage to the volume group / logical volume
  • fdisk /dev/sdd
    • n - create new partition
    • w - write changes
  • partprobe
  • pvcreate /dev/sdd1
  • vgextend vg1 /dev/sdd1
  • lvresize -L +1G /dev/vg1/website
  • df -h
  • resize2fs /dev/vg1/website
  • df -h
  • lvs or lvdisplay
• Verify volume added to /etc/fstab if needed at boot
  • more /etc/fstab/dev/mapper/vg1-lv1
  • /website ext4 defaults 1 1
    • 1 - Do backup
      • 1 - Do check for errors
• Tear it all down
  • umount /website
  • lvremove /dev/vg1/website
  • vgremove /dev/vg1
  • pvremove /dev/sdb1 /dev/sdc1 /dev/sdd1