Multiple Virtual Machines on windows 7

A new Laptop with the good resources with Windows 7 Ultimate which has got the Windows XP mode is really marvelous as most of the Oracle programs needs to be installed on x86 platform or in windows XP.


After a brief search for the free and reliable virtual machine for Windows 7 found Oracle VM Box. After Installation and when we tried to start the VMBOX, it keeps on getting the error as "VirtualBox can't operate in VMX root mode.

VBox status code: -4011 (VERR_VMX_IN_VMX_ROOT_MODE)."

After a few minutes of research and Google found that, we can;t open the 2 virtual machines on same system :(


Reason: VT-x and AMD-V compatible issues

So, need to use any of the one VM System at a time.

Solution: Shutdown the Microsoft Virtual Machine and it's Services and restart your computer. Later start the Oracle Virtual Box.

Editing the /etc/fstab in Maintenence Mode

While re-mounting the virtual machine on the other system, it was unable to recognize the 2 other volumes as they were mounted manually in the source system.To start the linux virtual machine it is required to make changes in the fstab file,  but it always used to open the read-only mode.Use the following procedure to make the read-only file system to Read-Write File-system:

1. Check the filesystems.
(Repair filesystem) 1 # fsck –a


2. Remount the root file system and make it writable.
(Repair filesystem) 2 # mount –o remount,rw /

3. Edit the /etc/fstab file, delete the line I had added, save and quit.
(Repair filesystem) 3 # vi /etc/fstab

4. Reboot the system.
(Repair filesystem) 4 # reboot