There are eight(8) functional steps to resize the logical volume in linux.
1. Increase A VMware Disk Size (VMDK) Formatted As Linux LVM
2. In VM OS, Create Partition
3. Reboot the VM
4. Format the new partition
5. Creates the physical volumes using pvcreate
6. Add physical volumes to a volume group using vgextend. vgextend allows you to add one or more initialized physical volumes to an existing volume group to extend it in size.
7. Extend the size of a logical volume using lvextend
8. Resize the logical volume size using resize2fs. The resize2fs program will resize ext2, ext3, or ext4 file systems. It can be used to enlarge or shrink an unmounted file system located on device.
[root@server ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 5.8G 4.3G 1.2G 79% /
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 506M 0 506M 0% /dev/shm
/dev/mapper/VolGroup00-datavol
13G 855M 12G 7% /data
/dev/mapper/VolGroup01-optvol
20G 173M 19G 1% /opt
[root@server ~]# fdisk -lu Disk /dev/sda: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors Units = sectors of 1 * 512 = 512 bytes Device Boot Start End Blocks Id System /dev/sda1 * 63 208844 104391 83 Linux /dev/sda2 208845 2313359 1052257+ 82 Linux swap / Solaris /dev/sda3 2313360 14667344 6176992+ 8e Linux LVM /dev/sda4 14667345 41929649 13631152+ 8e Linux LVM Disk /dev/sdb: 26.8 GB, 26843545600 bytes 255 heads, 63 sectors/track, 3263 cylinders, total 52428800 sectors Units = sectors of 1 * 512 = 512 bytes Device Boot Start End Blocks Id System /dev/sdb1 63 41929649 20964793+ 8e Linux LVM
[root@server ~]# fdisk /dev/sdb The number of cylinders for this disk is set to 3263. 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 e extended p primary partition (1-4) p Partition number (1-4): 2 First cylinder (2611-3263, default 2611): Using default value 2611 Last cylinder or +size or +sizeM or +sizeK (2611-3263, default 3263): Using default value 3263 Command (m for help): t Partition number (1-4): 2 Hex code (type L to list codes): 8e Changed system type of partition 2 to 8e (Linux LVM) Command (m for help): p Disk /dev/sdb: 26.8 GB, 26843545600 bytes 255 heads, 63 sectors/track, 3263 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 2610 20964793+ 8e Linux LVM /dev/sdb2 2611 3263 5245222+ 8e Linux LVM 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@server ~]# reboot
[root@server ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 5.8G 4.3G 1.2G 79% /
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 506M 0 506M 0% /dev/shm
/dev/mapper/VolGroup00-datavol
13G 855M 12G 7% /data
/dev/mapper/VolGroup01-optvol
20G 173M 19G 1% /opt
After the new partition table has been written, format the new partition.
[root@server ~]# mke2fs -j /dev/sdb2
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
656000 inodes, 1311305 blocks
65565 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1346371584
41 block groups
32768 blocks per group, 32768 fragments per group
16000 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
Creates the physical volumes using command below:
[root@server ~]# pvcreate /dev/sdb2 Physical volume "/dev/sdb2" successfully created
Scan all disks for physical volumes.
[root@server ~]# pvscan PV /dev/sdb1 VG VolGroup01 lvm2 [19.99 GB / 0 free] PV /dev/sda4 VG VolGroup00 lvm2 [13.00 GB / 0 free] PV /dev/sdb2 lvm2 [5.00 GB] Total: 3 [37.99 GB] / in use: 2 [32.99 GB] / in no VG: 1 [5.00 GB]
Add physical volumes to a volume group. This example add /dev/sdb2 to VolGroup01
[root@server ~]# vgextend VolGroup01 /dev/sdb2 Volume group "VolGroup01" successfully extended
[root@server ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 5.8G 4.3G 1.2G 79% /
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 506M 0 506M 0% /dev/shm
/dev/mapper/VolGroup00-datavol
13G 855M 12G 7% /data
/dev/mapper/VolGroup01-optvol
20G 173M 19G 1% /opt
Extend the size of a logical volume using lvextend.
[root@server ~]# lvextend -l +100%FREE /dev/VolGroup01/optvol Extending logical volume optvol to 24.99 GB Logical volume optvol successfully resized
Resize the logical volume size using resize2fs.
[root@server ~]# resize2fs /dev/mapper/VolGroup01-optvol resize2fs 1.39 (29-May-2006) Filesystem at /dev/mapper/VolGroup01-optvol is mounted on /opt; on-line resizing required Performing an on-line resize of /dev/mapper/VolGroup01-optvol to 6551552 (4k) blocks. The filesystem on /dev/mapper/VolGroup01-optvol is now 6551552 blocks long.
[root@server ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 5.8G 4.3G 1.2G 79% /
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 506M 0 506M 0% /dev/shm
/dev/mapper/VolGroup00-datavol
13G 855M 12G 7% /data
/dev/mapper/VolGroup01-optvol
25G 173M 24G 1% /opt
Amit
Thanks Dude!
Great Work.
Shahzaib
Thanks a lot for this article… you saved the day and i Learned a lot.