Thanks Stefanha.
If we use the commad virsh attach-disk rhel64-64 /home/images/virtio-scsi11.img --persistent sdr --cache writethrough the qcow2 images will also gets added as raw which is by default. Hence we should use
"virsh attach-disk rhel64-64 /home/images/virtio-scsi11.img --persistent sdr --cache writethrough --sourcetype file --driver qemu --subdriver qcow2".
Thanks Stefanha.
If we use the commad virsh attach-disk rhel64-64 /home/images/ virtio- scsi11. img --persistent sdr --cache writethrough the qcow2 images will also gets added as raw which is by default. Hence we should use
"virsh attach-disk rhel64-64 /home/images/ virtio- scsi11. img --persistent sdr --cache writethrough --sourcetype file --driver qemu --subdriver qcow2".