hypervisor: 0.954
architecture: 0.906
kernel: 0.867
virtual: 0.861
KVM: 0.838
x86: 0.828
device: 0.763
graphic: 0.688
performance: 0.656
ppc: 0.584
semantic: 0.552
socket: 0.525
debug: 0.525
register: 0.523
PID: 0.518
files: 0.509
assembly: 0.496
mistranslation: 0.481
user-level: 0.463
network: 0.459
i386: 0.414
vnc: 0.345
peripherals: 0.335
boot: 0.320
permissions: 0.307
risc-v: 0.260
arm: 0.253
VMM: 0.203
TCG: 0.167

could not open disk image

After restart the server it's show this error:

Error starting domain: internal error process exited while connecting to monitor: char device redirected to /dev/pts/1
qemu-kvm: -drive file=/var/lib/nova/instances/b4535ce9-54b5-4581-a906-16b83bf1ba2f/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: could not open disk image /var/lib/nova/instances/b4535ce9-54b5-4581-a906-16b83bf1ba2f/disk: No such file or directory

the disk info show 
 qemu-img info disk
image: disk
file format: qcow2
virtual size: 100G (107374182400 bytes)
disk size: 22G
cluster_size: 65536
backing file: /var/lib/nova/instances/_base/b4535ce9-54b5-4581-a906-16b83bf1ba2f

but this file (backing file : /var/lib/nova/instances/_base/b4535ce9-54b5-4581-a906-16b83bf1ba2f) is empty.
And all the instances cant't find the disk image

We use CentOS release 6.5 (64bit)
kernel version : 2.6.32-431.11.2.el6.x86_64
qemu-kvm-0.12.1.2-2.415.el6_5.10.x86_64

virsh version
Compiled against library: libvirt 0.10.2
Using library: libvirt 0.10.2
Using API: QEMU 0.10.2
Running hypervisor: QEMU 0.12.1

Triaging old bug tickets ... can you still reproduce this problem with the latest release of QEMU? how did you create the disk image?

[Expired for QEMU because there has been no activity for 60 days.]