Extend or increase LVM Partition size using lvextend command in linux

Posted: March 6, 2017 in RAID and LVM
Tags: ,

If you are working as a Linux System Admin then resizing the file system size is an important task for you and you must know that.Here in this tutorial we are going to learn how to increase or extend lvm partition size.As we all know LVM provides us the facility to increase or reduce the of partition.

So here we will learn to increase lvm size using lvextend command.but before that we will create lvm first and mount it so that it is ready for use.

STEP1: Create Physical Volumes using pvcreate command.

 

[root@localhost ~]# pvcreate /dev/sda{5,6,7}
 Physical volume "/dev/sda5" successfully created
 Physical volume "/dev/sda6" successfully created
 Physical volume "/dev/sda7" successfully created

now check the create physical volume using pvscan.

[root@localhost ~]# pvscan
 PV /dev/sda5 lvm2 [964.81 MB]
 PV /dev/sda6 lvm2 [964.81 MB]
 PV /dev/sda7 lvm2 [831.46 MB]
 Total: 3 [2.70 GB] / in use: 0 [0 ] / in no VG: 3 [2.70 GB]

 

STEP2: create Volume Group using vgcreate command

 

[root@localhost ~]# vgcreate vg00 /dev/sda{5,6,7}
 Volume group "vg00" successfully created

 

[root@localhost ~]# vgs
 VG #PV #LV #SN Attr VSize VFree
 vg00 3 0 0 wz--n- 2.69G 2.69G
[root@localhost ~]# pvscan
 PV /dev/sda5 VG vg00 lvm2 [964.00 MB / 964.00 MB free]
 PV /dev/sda6 VG vg00 lvm2 [964.00 MB / 964.00 MB free]
 PV /dev/sda7 VG vg00 lvm2 [828.00 MB / 828.00 MB free]
 Total: 3 [2.69 GB] / in use: 3 [2.69 GB] / in no VG: 0 [0 ]
 [root@localhost ~]#
STEP3: Create Logical Volume(lvm) name lv1 using lvcreate command.
[root@localhost ~]# lvcreate -L +1G -n lv1 vg00
 Logical volume "lv1" created
 [root@localhost ~]# lvs
 LV VG Attr LSize Origin Snap% Move Log Copy% Convert
 lv1 vg00 -wi-a- 1.00G
 [root@localhost ~]#

 

[root@localhost ~]# lvdisplay
 --- Logical volume ---
 LV Name /dev/vg00/lv1
 VG Name vg00
 LV UUID YYXZk0-bs6F-wE8z-88P3-f67R-G4vj-IrohD2
 LV Write Access read/write
 LV Status available
 # open 0
 LV Size 1.00 GB
 Current LE 256
 Segments 2
 Allocation inherit
 Read ahead sectors auto
 - currently set to 256
 Block device 253:0
 [root@localhost ~]#
[root@localhost ~]# pvscan
 PV /dev/sda5 VG vg00 lvm2 [964.00 MB / 0 free]
 PV /dev/sda6 VG vg00 lvm2 [964.00 MB / 904.00 MB free]
 PV /dev/sda7 VG vg00 lvm2 [828.00 MB / 828.00 MB free]
 Total: 3 [2.69 GB] / in use: 3 [2.69 GB] / in no VG: 0 [0 ]
 [root@localhost ~]#

 

STEP4: Format and Mount it so that it is ready for use.

First format the file system using mkfs.ext3 command.

 

[root@localhost ~]# mkfs.ext3 /dev/vg00/lv1

 

Then create a directory to mount newly created File System.
[root@localhost ~]# mkdir /lvmdata

 

Now mount newly created file system using mount command to use.
[root@localhost ~]# mount /dev/vg00/lv1 /lvmdata

 

STEP5: View it’s size using lvs, lvdisplay or df -Th command.

 

[root@localhost ~]# df -h
 Filesystem Size Used Avail Use% Mounted on
 /dev/sda1 25G 2.1G 22G 9% /
 tmpfs 1014M 0 1014M 0% /dev/shm
 /dev/mapper/vg00-lv1 1008M 34M 924M 4% /lvmdata
 [root@localhost ~]#

 

[root@localhost ~]# lvs
 LV VG Attr LSize Origin Snap% Move Log Copy% Convert
 lv1 vg00 -wi-ao 1.00G
 [root@localhost ~]#
STEP6:Before making change to lvm check the free available space in the volume group “vg00”.
[root@localhost ~]# vgdisplay vg00
 --- Volume group ---
 VG Name vg00
 System ID
 Format lvm2
 Metadata Areas 3
 Metadata Sequence No 2
 VG Access read/write
 VG Status resizable
 MAX LV 0
 Cur LV 1
 Open LV 1
 Max PV 0
 Cur PV 3
 Act PV 3
 VG Size 2.69 GB
 PE Size 4.00 MB
 Total PE 689
 Alloc PE / Size 256 / 1.00 GB
 Free PE / Size 433 / 1.69 GB
 VG UUID vBYPKn-9Bpk-jvK2-tc2e-e78U-V5jq-lgbcbZ
 [root@localhost ~]#

 

STEP7:Use lvextend command to increase the size of lvm named “lv1”

 

[root@localhost ~]# lvextend -L +500M /dev/vg00/lv1
 Extending logical volume lv1 to 1.49 GB
 Logical volume lv1 successfully resized
STEP8:check file system size using lvs or lvdisplay.
[root@localhost ~]# lvs
 LV VG Attr LSize Origin Snap% Move Log Copy% Convert
 lv1 vg00 -wi-ao 1.49G
 [root@localhost ~]#

 

You can see above output the file size increased here.

 

STEP9:Check Mounted file system size using DF -h

 

[root@localhost ~]# df -Th
 Filesystem Type Size Used Avail Use% Mounted on
 /dev/sda1 ext3 25G 2.1G 22G 9% /
 tmpfs tmpfs 1014M 0 1014M 0% /dev/shm
 /dev/mapper/vg00-lv1
 ext3 1008M 34M 924M 4% /lvmdata
 [root@localhost ~]#

but you can see File system size not updated here because to update it we need to run resize2fs command.

 

STEP10:Run resize2fs command to resize the file system size.
[root@localhost ~]# resize2fs /dev/vg00/lv1
 resize2fs 1.39 (29-May-2006)
 Filesystem at /dev/vg00/lv1 is mounted on /lvmdata; on-line resizing required
 Performing an on-line resize of /dev/vg00/lv1 to 390144 (4k) blocks.
 The filesystem on /dev/vg00/lv1 is now 390144 blocks long.
 [root@localhost ~]#
STEP11: Again check mounted file system size using df -h.

 

[root@localhost ~]# df -h
 Filesystem Size Used Avail Use% Mounted on
 /dev/sda1 25G 2.1G 22G 9% /
 tmpfs 1014M 0 1014M 0% /dev/shm
 /dev/mapper/vg00-lv1 1.5G 34M 1.4G 3% /lvmdata
 [root@localhost ~]#
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