Today we will see how to increase Logical volume size when we have space available in our Volume Group.
If the space is not available then you need to check PV size and if any spare disk available on the server.
1.First check the partition if the selected partition is a LV and lies in VG(Volume Group).
[root@cf222 ~]# df -h /opt/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-opt_vol 4.0G 3.8G 0 100% /opt
/dev/mapper are the links to original devices which are in /dev/VGNAME. So to find the original LV name, run below command:
[root@cf121 ~]# lvdisplay /dev/mapper/VolGroup00-opt_vol
--- Logical volume ---
LV Name /dev/VolGroup00/opt_vol
VG Name VolGroup00
LV UUID g0mIoQ-SQ9S-YmR5-I4ZY-Vexc-KxpK-r3Uld5
LV Write Access read/write
LV Status available
# open 1
LV Size 16.00 GB
Current LE 512
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:2
2.Here we can see that this LV lies in VG named VolGroup00. So lets view this VG properties.
[root@cf121 ~]# vgdisplay VolGroup00
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 11
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 8
Open LV 8
Max PV 0
Cur PV 1
Act PV 1
VG Size 68.06 GB
PE Size 32.00 MB
Total PE 2178
Alloc PE / Size 1022 / 29.94 GB
Free PE / Size 1156 / 38.12 GB
VG UUID rwWQQ2-3dCn-YjLq-4JoB-Tbui-VcYN-IQLGnp
Here we can see that this VG has 36GB of free space. So we can extend any LV inside this VG upto this limit.
3.Now to increase the LV size just run lvextend command.
[root@cf222 ~]# lvextend -L6G /dev/VolGroup00/opt_vol
/dev/cdrom: open failed: Read-only file system
Extending logical volume opt_vol to 6.00 GB
Logical volume opt_vol successfully resized
Here –L extends the LV to mentioned size. Please use this command with caution because +L and –L denotes different meaning with lvextend.
Here we have increased the LV size, but the recalculation of the increased blocks can only be done on the un-mounted partition. So we need to umount this partition /opt.
Now umount /opt partition.
[root@cf222 ~]# umount /opt/
Now run fsck for filesystem check.
[root@cf222 ~]# e2fsck -f /dev/VolGroup00/opt_vol
e2fsck 1.35 (28-Feb-2004)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/VolGroup00/opt_vol: 92001/524288 files (1.4% non-contiguous), 866982/1048576 blocks
Execute resize2fs to recalculate LV size.
[root@cf222 ~]# resize2fs /dev/VolGroup00/opt_vol
resize2fs 1.35 (28-Feb-2004)
Resizing the filesystem on /dev/VolGroup00/opt_vol to 1572864 (4k) blocks.
The filesystem on /dev/VolGroup00/opt_vol is now 1572864 blocks long.
Now mount it back.
[root@cf222 ~]#mount /opt
[root@cf222 ~]# df -h /opt/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-opt_vol 6.0G 3.3G 2.5G 58% /opt
[root@cf222 ~]#
Here we can see the LV size is increased now by 2GB.
