====== Expand Disk on VM ======

===== VMWare Instruction =====

**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 [[https://kb.vmware.com/selfservice/search.do?cmd=displayKC&docType=kc&docTypeID=DT_KB_1_1&externalId=1004047|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:

<code>
    # fdisk -l
</code>

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

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

    * 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:

<code>
    # fdisk -l
</code>

  * 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.

<code>
    # pvcreate /dev/sda3
</code>

  * Run this command to extend the physical volume:

<code>
    # vgextend VolGroup /dev/sda3
</code>

**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:

<code>
    # vgdisplay VolGroup | grep "Free"
</code>

  * Run the following command to extend the Logical Volume:

<code>
    # lvextend -L+#G /dev/VolGroup00/LogVol00
</code>

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  

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

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

<code>
    # resize2fs /dev/VolGroup/lv_home
</code>

**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:

<code>
    # df -h / 
</code>

===== From Emmanuel =====

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 .