Você tem que indefinir a máquina virtual. Se o seu funcionamento parar,
[root@fed18 isos]# virt-install --hvm --name OracleLinux64-1 --ram 2048 --vcpus 1 -f /dev/virtual-machines/OracleLinux64-1 --network bridge=br0 --cdrom /isos/Oracle_Linux_Release_6_Update_4_x86_64.iso --graphics vnc,listen=0.0.0.0,port=5901 --noautoconsole
warning: failed to set locale, defaulting to C
ERROR Guest name 'OracleLinux64-1' is already in use.
root@fed18 ~]# virsh
setlocale: No such file or directory
Welcome to virsh, the virtualization interactive terminal.
Type: 'help' for help with commands
'quit' to quit
virsh # undefine OracleLinux64-1
Domain OracleLinux64-1 has been undefined
virsh # quit
[root@fed18 ~]# virt-install --hvm --name OracleLinux64-1 --ram 2048 --vcpus 1 -f /dev/virtual-machines/OracleLinux64-1 --network bridge=br0 --cdrom /isos/Oracle_Linux_Release_6_Update_4_x86_64.iso --graphics vnc,listen=192.168.2.103,port=5901 --noautoconsole
warning: failed to set locale, defaulting to C
Starting install...
Creating domain... | 0 B 00:00:12
Domain installation still in progress. You can reconnect to
the console to complete the installation process.