Wow… Seriously awesome!

For experiment sake, I decided to duplicate my newly created RHEL session using ZFS.  My Fedora and RHEL virtual instances each live on their own zvol.  As you can see below, each VM has a zvol named disk0:

# zfs list -r local
NAME                                    USED  AVAIL  REFER  MOUNTPOINT
local                                   196G   717G    31K  /local
local/shared                            196G   717G   172G  /shared
local/shared/Virtual                   24.2G   717G    33K  /shared/Virtual
local/shared/Virtual/ISO               3.56G   717G  3.56G  /shared/Virtual/ISO
local/shared/Virtual/KVM               20.6G   717G    36K  /shared/Virtual/KVM
local/shared/Virtual/KVM/fedora        10.3G   717G    31K  /shared/Virtual/KVM/fedora
local/shared/Virtual/KVM/fedora/disk0  10.3G   724G  2.94G  -
local/shared/Virtual/KVM/rhel          10.3G   717G    31K  /shared/Virtual/KVM/rhel
local/shared/Virtual/KVM/rhel/disk0    10.3G   724G  2.89G  -

To duplicate the RHEL virtual machine, I first created a snapshot of the volume while the RHEL VM was booted.

# zfs snapshot local/shared/Virtual/KVM/rhel/disk0@booted

I then cloned the RHEL VM to a new zvol:

# zfs clone -p local/shared/Virtual/KVM/rhel/disk0@booted local/shared/Virtual/KVM/rhel2/disk0

With the new cloned zvol, rhel2, the local zpool now looks like this:

# zfs list -r local
NAME                                    USED  AVAIL  REFER  MOUNTPOINT
local                                   199G   714G    31K  /local
local/shared                            199G   714G   172G  /shared
local/shared/Virtual                   27.1G   714G    33K  /shared/Virtual
local/shared/Virtual/ISO               3.56G   714G  3.56G  /shared/Virtual/ISO
local/shared/Virtual/KVM               23.5G   714G    39K  /shared/Virtual/KVM
local/shared/Virtual/KVM/fedora        10.3G   714G    31K  /shared/Virtual/KVM/fedora
local/shared/Virtual/KVM/fedora/disk0  10.3G   721G  3.04G  -
local/shared/Virtual/KVM/rhel          13.2G   714G    31K  /shared/Virtual/KVM/rhel
local/shared/Virtual/KVM/rhel/disk0    13.2G   724G  2.89G  -
local/shared/Virtual/KVM/rhel2         30.1M   714G    31K  /shared/Virtual/KVM/rhel2
local/shared/Virtual/KVM/rhel2/disk0   30.0M   714G  2.89G  -

I modified my kvm start script with a new MAC address and vnic and booted the new virtual machine.

Duplicated RHEL

I created and booted a completely new RHEL VM instance in literally less than a minute!