How to add an additional hard drive to Xen VM

There are cases where you would like to add an additional disk to a Xen guest VM, and make the newly added storage available to the VM. In order to add an additional hard drive to Xen VM, do the following.

On Dom0, create an image file for a new hard drive, and edit the Xen DomU config file for the VM to include the drive. In this example, I'll create a 10GB disk.

$ sudo dd if=/dev/zero of=/vm/myvm-disk2.img bs=1M count=10240
$ sudo vi /etc/xen/myvm.cfg
disk = ['file:/vm/myvm-disk1.img,xvda,w','file:/vm/myvm-disk2.img,xvdb,w'] 

Now start the Xen VM. The Xen VM should now see a new block device /dev/xvdb.

On Xen VM, configure the newly added disk as follows.

$ sudo mkfs.ext3 /dev/xvdb
$ sudo vi /etc/fstab
/dev/xvdb  /disc   ext3    defaults   0   0
$ sudo mount -a

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Dan Nanni is the founder and also a regular contributor of He is a Linux/FOSS enthusiast who loves to get his hands dirty with his Linux box. He likes to procrastinate when he is supposed to be busy and productive. When he is otherwise free, he likes to watch movies and shop for the coolest gadgets.

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