[sheepdog] reply: execute the snapshot vm became read-only

[周鹏]

On Fri, Aug 09, 2013 at 03:03:13AM +0000, zhoupeng wrote:
> hello,i test snapshot of sheepdog version 0.6 stable.
> first,i start the sheep with one node:
>
> #!/bin/bash
> sheep /home/cloud -u -g -d 64 -z 0 -D -c local
> for i in {0..0}
> do
> sheep /home/${i} -u -D -d -c local -p $((7001 + $i))
> done
>
> then i use libvirt to start the vdi, by using vnc to login the vdi;
> i create a file and write sth, everything is ok;
>
> but after i execute the snapshot:
> qemu-img snapshot -c sheepdog:centos6 sheepdog:centos6

Your qemu might be too old. Try latest QEMU at git://git.qemu.org/qemu.git

thanks much.i have update qemu to the latest. Excute snapshot is ok now, but 
when the vm is running, perform the following steps:
1.  write some data to a file
2.  sync
3.  create a snapshot
4.  delete the file.
5.  shutdown the vm rollbak to the snapId(collie vdi rollback centsos6-test -s 11)
6.  enter the vm and the file came back

but if not shutdown the vm, excute above steps, the file will not be restored.it means that sheepdog
dose not support hot snapshot. am i right?