xm block-list centos59
Vdev BE handle state evt-ch ring-ref BE-path
768 0 0 1 -1 -1 /local/domain/0/backend/vbd/149/768 5632 0 0 1 -1 -1 /local/domain/0/backend/vbd/149/5632
xm block-detach centos59 5632 -f
xm block-attach centos59 file://hdb/share/iso/CentOS-5.9-x86_64-bin-DVD-2of2.iso /dev/hdc r