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====== General guide for LVM ======

===== Prepare new disk/VolumeGroup/Logical Volume =====

Prepare PV's with
  pvcreate /dev/<device>
For FC LUN's use /dev/mapper/mpath<x> according to Red Hat DM Multipath Configuration & Administration

Create VG
  vgcreate <vgname> -s <Physical Extent size> <path to PV>
  
Create LV
  lvcreate --name <lvname> --size <xx>G <vgname>
  
Create filesytem
   mkfs.ext4 -F -b 4096 /dev/<vgname>/<lvname>
Depending on distribution use relevant ext2/ext3/ext4 file system type.

===== Resize existing Logical volume =====

Extend the disk on the underlying infrastructure (SAN LUN / Virtulization platform)

Make OS detect the changed disk size

echo 1 > /sys/block/<device>/device/rescan

Where the <device> paramter is the physical disk eg. sdb

Resize Physical Volume
   pvresize /dev/<device>

Extend Logical Volume
    lvextend -l 100%VG <lvname>
check man lvextend for further options

Extend filesytem which resides on Logical Volume
   resize2fs /dev/<vgname>/<lvname>

[[https://access.redhat.com/kb/docs/DOC-9855]]

sys64738

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