HOW TO INCREASE OR EXTEND SIZE OF LVM (LOGICAL VOLUME) IN LINUX

In this article we will learn how to increase or extend logical volume size . 

lvm

Follow these steps to increase size of lvm :

  • I’ m going to create three partitions .
[root@localhost ~]# fdisk /dev/sda
The number of cylinders for this disk is set to 6147.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (5482-6147, default 5482):
Using default value 5482
Last cylinder or +size or +sizeM or +sizeK (5482-6147, default 6147): +500M

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (5544-6147, default 5544):
Using default value 5544
Last cylinder or +size or +sizeM or +sizeK (5544-6147, default 6147): +500M

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (5606-6147, default 5606):
Using default value 5606
Last cylinder or +size or +sizeM or +sizeK (5606-6147, default 6147): +500M

Command (m for help): p
Disk /dev/sda: 50.5 GB, 50562793472 bytes
255 heads, 63 sectors/track, 6147 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        5099    40957686   83  Linux
/dev/sda2            5100        5481     3068415   82  Linux swap / Solaris
/dev/sda4            5482        6147     5349645    5  Extended
/dev/sda5            5482        5543      497983+  83  Linux
/dev/sda6            5544        5605      497983+  83  Linux
/dev/sda7            5606        5667      497983+  83  Linux

Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[root@localhost ~]# partprobe /dev/sda
  • Now convert these partitions into physical volumes .
[root@localhost ~]# pvcreate /dev/sda5 /dev/sda6 /dev/sda7
  Physical volume "/dev/sda5" successfully created
  Physical volume "/dev/sda6" successfully created
  Physical volume "/dev/sda7" successfully created
  • Then create vg (volume group) including these physical volume sda5 , sda6, sda7 
[root@localhost ~]# vgcreate vg00 /dev/sda5 /dev/sda6 /dev/sda7
  Volume group "vg00" successfully created
  • Let’s create lvm(logical volume) over vg (volume group) .
[root@localhost ~]# lvcreate -L +600M -n lv1 vg00
  Logical volume "lv1" created
  • You can see logical volume is been created with 600M
[root@localhost ~]# lvs
  LV   VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  lv1  vg00 -wi-a- 600.00M

LVM in linux

  • Now we are going to increase or extend size of lvm(logical volume)
[root@localhost ~]# lvextend -L +400M /dev/vg00/lv1
  Extending logical volume lv1 to 1000.00 MB
  Logical volume lv1 successfully resized
  • You can see your size has been increased . Now its 1000M
[root@localhost ~]# lvs
  LV   VG   Attr   LSize    Origin Snap%  Move Log Copy%  Convert
  lv1  vg00 -wi-a- 1000.00M

So this is how you can increase or extend size of lvm (logical volume)

HOW TO REDUCE THE SIZE OF VG(VOLUME GROUP) IN LINUX

HOW TO MERGE TWO VG(VOLUME GROUP) INTO ONE

HOW TO CONFIGURE RAID WITH SPARE DEVICES

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s