Expand Disk on VM

Note: These steps only apply to EXT3 file systems.

Caution: VMware recommends to take a complete backup of the virtual machine prior to making these changes.

• Power off the virtual machine.
• Edit the virtual machine settings and extend the virtual disk size. For more information, see Increasing the size of a virtual disk (1004047).
• Power on the virtual machine.
• Identify the device name, which is by default /dev/sda, and confirm the new size by running the command:

    # fdisk -l

• Create a new primary partition:
  • Run the command:

    # fdisk /dev/sda (depending the results of the step 4)

• Press p to print the partition table to identify the number of partitions. By default, there are 2: sda1 and sda2.
• Press n to create a new primary partition.
• Press p for primary.
• Press 3 for the partition number, depending on the output of the partition table print.
• Press Enter two times.
• Press t to change the system's partition ID.
• Press 3 to select the newly creation partition.
• Type 8e to change the Hex Code of the partition for Linux LVM.
• Press w to write the changes to the partition table.

• Restart the virtual machine.
• Run this command to verify that the changes were saved to the partition table and that the new partition has an 8e type:

    # fdisk -l

• Run this command to convert the new partition to a physical volume:

Note: The number for the sda can change depending on system setup. Use the sda number that was created in step 5.

    # pvcreate /dev/sda3

• Run this command to extend the physical volume:

    # vgextend VolGroup /dev/sda3

Note: To determine which volume group to extend, use the command vgdisplay.

• Run this command to verify how many physical extents are available to the Volume Group:

    # vgdisplay VolGroup | grep "Free"

• Run the following command to extend the Logical Volume:

    # lvextend -L+#G /dev/VolGroup00/LogVol00

Where # is the number of Free space in GB available as per the previous command. Use the full number output from Step 10 including any decimals.

Note: To determine which logical volume to extend, use the command lvdisplay.

• Or to resize to the number of free extents rather than adding them to the current size in RHEL
• To resize to the number of free extents rather than adding them to the current size in RHEL

    # lvextend -l +100%FREE /dev/VolGroup/lv_home

• Run the following command to expand the ext3 filesystem online, inside of the Logical Volume:

    # resize2fs /dev/VolGroup/lv_home

Notes:

• Use resize2fs instead of ext2online if it is not a Red Hat virtual machine.
• By default, Red Hat and CentOS 7 use the XFS file system you can grow the file system by running the xfs_growfs command.

• Run the following command to verify that the / filesystem has the new space available:

    # df -h / 

Just powered down the Vm, increased the disk allocation from vcentre . Power the vm back up. Confirm the kernel is the seeing the increased disk on the existing sda disk .

Use fdisk to create a primary /dev/sda3 partition from the newly allotted space in sda . Use partprobe or reboot to allow the kernel to re-read the device mapping .

After reboot or partprobe , prepare the new device partition into physical logical volume to be added to the existing volume group . This is done with command : pvcreate /dev/sda3

I added the new physical volume to the existing volume group using : vgextend <volume group name> /dev/sda3

Then expand the logical volume in the volume group on which the /home is mounted. Used below command to allow the lv to use up any available free space within volume group

lvextend -l +100%FREE /dev/volume group / logical volume name

Then I brought the new disk size on home mount point online using

resize2fs /dev/volume group/logical volume name .