Working With LVM In Linux
Creating a new volume group, adding a disk to it and making it usable
#fdisk /dev/sda5 (or /dev/mapper/mpathx if multipathing) … create new partition, type lvm (8e), write changes to disk
#partprobe
#pvscan
#pvdisplay
#kpartx -a /dev/mapper/mpathX if it’s a multipathed device using dm-mulipath, otherwise skip this step
#pvcreate /dev/sda5 or /dev/mapper/mpathXpX (initializes partition for LVM)
#vgcreate vg02 /dev/sda5 or /dev/mapper/mpathXpX (or vgextend vg02 /dev/sda5 or /dev/mapper/mpathXpX to add to a volume group)
#lvcreate -L 500G -n lvora_backup vg02 (or lvextend to add)
#mkfs -V -t ext3 /dev/mapper/vg02-lvora_backup (or resize2fs to extend the fs)
#mount /dev/mapper/vg02-lvora_backup /ora_backup
edit /etc/fstab:
/dev/vg02/lvora_backup /ora_backup ext3 defaults 1 2
Extending a logical volume if the vg has available space
lvextend -L +512M /dev/rootvg/lvtmp
resize2fs /dev/rootvg/lvtmp