Increase size of OracleVM Hard Disk

Normally a 10 GB Hard disk will not take that much space when you create an “dynamically expanding storage” HDD in OracleVM.  The size will be  the total size of data which you store on that hard disk.  So when you create an HDD in OracleVM select “dynamically expanding storage” and put maximum size you may require.

The OracleVM does  not have a built in utility to increase the hard disk size.  But the following work around helped me to increase the  size.

1. Select the OracleVM which has got the low disk space.

2. Select Settings and click on “Storage” and click on the icon “Add Hard disk”

3.  Select “Create new disk” and create a hard disk with the required disk space.

4. Select the newly created hard disk and change the attribute as shown in figure below. If your first hard disk is “IDE Primary Master” then your second hard disk should be “IDE Secondary Master”.

5. Boot the VM and install any disk cloning tool which works with your OS in VM.  I used demo version of  Migrate Easy from Acronis which worked just fine for me to clone my Windows 2003 VM HDD. If you does not have enough space to install the software add a new hdd to VM  and install the software on that. If you have little space on first hdd change the  TEMP settings of existing VM from the “Environment Variables” settings. See the screen shot.

6.  After the installation open the disk cloning tool and click trial and then click on “Disk Clone”. Click “Next”  and select “Automatic” and click next select the first hard(disk with low disk space ) disk and click next and select the second hdd and continue. It will ask restart the system, restart the VM so that the cloning will start automatically when the VM starts. After cloning the first hdd to new hdd shutdown the VM.

7. Select the VM and click settings. select “Storage” and remove the first hdd. Select the new vdi image  and change the Attribute to “IDE Primary Master”  which is the attribute of the first hdd  you  removed.

Boot into to the VM with the new hdd with increased space !


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  1. #1 by Paul on June 24, 2012 - 11:16 AM

    Awesome step by step, works an absolute treat, exactly what i needed. thank you very much.

  2. #2 by Aparna on July 31, 2012 - 7:11 AM

    Unable to install Migrate Easy. Message “Failed to register product” comes up. Any ways out? Proxy is not on and firewall is disabled. Still same error.

    • #3 by Shyju Kanaprath on July 31, 2012 - 10:24 AM

      Just add one more Network adaptor in bridge mode to VM., and put your LAN IP(don’t change have dhcp server).Make sure you could access internet from VM. Try installing again.




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