Logical Volume basic command

Create LVM

show all HDD currently available

# fdisk -cul

select hdd that you wish to make into LVM

# fdisk -cu /dev/sdb

create partition and set it the system type to LVM

# p  ( print all partition )

# n  ( create new partition )

# t  ( change system type )

# 8e ( change it to LVM type )
# w  ( save it )

After done, you will see /dev/sdb1 was created

now we proceed to create LVM

# pvcreate /dev/sdb1

# vgcreate vg00 /dev/sdb1

This will create a volume group name vg00

# lvcreate -L 10G --name lvdata vg00

This will create a logical volume name lvdata with 10G size from vg00

# mkfs.ext4  /dev/mapper/vg00-lvdata

This will format the LV we created to ext4 format so we can use it

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Replace HDD for LVM

# pvscan

# vgextend vg00 /dev/xvdk1 

# pvmove /dev/xvdf1

# vgreduce vg00 /dev/xvdf1

#  pvremove /dev/xvdf1

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Adding existing VG into new server

# vgexport vg00
# vgimport vg00
# vgchange -ay vg00

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Reduce LV

# unmount /home
# e2fsck -f /dev/mapper/vg00-lvhome
# resize2fs -p /dev/mapper/vg00-lvhome 3G
# lvreduce -L 3G /dev/mapper/vg00-lvhome
# e2fsck -f /dev/mapper/vg00-lvhome

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Extend LV

#  lvextend -l +100%FREE /dev/mapper/vg00-lvvar
# resize2fs -p /dev/mapper/vg00-lvvar