LVM Configuration and Management

1 => Install package for LVM

#apt-get install lvm2 

Or 

#yum install lvm2

2 => Create physical partition  

#pvcreate /dev/sdb1 /dev/sdb2

3 => Create volume Group

#vgcreate VG0 /dev/sdb1
         or 
#vgcreate VG0 /dev/sdb1 /dev/sda3

#vgchange -a y VG0
 

4 => Create Logical Volumes

#lvcreate -l 100%FREE -n LV001 VG0
#mkfs.ext4 /dev/VG0/LV001

5 => Mount Partition Permanently 

#vim /etc/fstab

/dev/VG0/LV001  /opt  ext3    defaults 0 0

#Save file and run below command  to check

#mount -a

TO add New harddisk or New Partation in LVM 

1 => Check current size of LVM

 #lvdisplay 

2 => Check Current physical partition   

 #pvdisplay 

3 => 
fdisk -l
pvcreate /dev/sdd1
pvcreate /dev/sdc1
pvdisplay 
vgdisplay 
vgextend VG0 /dev/sdc1
vgdisplay 
vgextend VG0 /dev/sde1
vgdisplay 
lvdisplay 
lvextend -l +100%FREE /dev/mapper/VG0-LV001
resize2fs /dev/mapper/VG0-LV001
lvdisplay 
df -h