What is LVM ? How to create LVM Partition ?

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LOGICAL VOLUME MANAGEMENT:
 
 
 
 

LVM(Logical Volume Management)



MBR
Partition
P
Sda1
P
Sda2
P
Sda3
P
Sda4
M
B
R
P1
Sda1
P2
Sda2
P3
Sda3
Extended Partition  (sda4)
Logical Partitions are sub partition of Extended Partition.
L1
Sda5
L2
Sda6
L3
Sda7
L4
Sda8
L5
Sda9
L6
Sda10
L7
Sda11
L8
12
L9
(13)
L10
(14)
L11 Sda
(15)
Primary Physical Partition = 4

Physical Partition : (3P+1E) =   4
Physical + Logical Partition =     (3P+1E)  +  (11L) =  15 Partition . 
How to use LVM:
P
P
P
LVM  (50G)
           
PV      
Physical Valume
VG     
 Volume Group  
LV1 …N           
 Logical Volume Group                                       

P
P
P
LVM  (50G)

P
P
P
LVM  (50G)
                                          

 

PV      
                                                                                               

PV      


VG

Lv01 … Lv0N
                                          

                                          
M
B
R
P
P
P
Extended  Partition
LVM
LVM
LVM



PV


PV




PV
VG

                                           
 
 
 
 
 
 
 
 HOW TO CREATE PV,VG AND LV:
``````````````````````````
1. CREATE A PARTITION AND MARK IT AS LVM

2. CREATE A PHYSICAL VOLUME FROM ABOVE PARTITION
 pvcreate /dev/sda5
3. CREATE VOLUME GROUP FROM THE PHYSICAL VOLUME
 vgcreate VGUCLID /dev/sda5
4. create LOGICAL VOLUMES
 syn: lvcreate -n <lvname> [-l <size_in_extents> | -L <size> <vgname>

 ex: lvcreate -n lv01 -L 1G VGUCLID
5. format the partition and mount it
 # mkfs.ext4 /dev/VGUCLID/lv01
 # mkdir /lvm1
 # mount /dev/VGUCLID/lv01 /lvm1


how to extend LV size:

1. lvextend -L +1G /dev/VGUCLID/lv01
2. resize2fs /dev/VGUCLID/lv01

how to reduce LV size:

1. unmount the partition
2. check the file system
 e2fsck -f /dev/VGUCLID/lv01
3. resize the file system
 resize2fs /dev/VGUCLID/lv01 1G

4. lvreduce -L 1G /dev/VGUCLID/lv01

5. mount the partition

how to extend Volume Group:

1. create a partition usinf fdisk and mark it as LVM
2. create a physical volume from above partition
 pvcreate /dev/sda6
3. extend the Volume Group
 vgextend VGUCLID /dev/sda6

6.Taking a snapshort (backup) of logical valume:



step1 :lvcreate -s -n lv01_bkp -L 1G /dev/vgvedic/lv01



Recovery of backup:

step 1: unmount the partition 
 unmount /dev/vgvedic/lv01

step2: lvconvert --merge /dev/vgvedic/lv01_bkp
step 3: mount /dev/vgvedic/lv01 /u01
step 3: mount /dev/vgvedic/lv01 /u01

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