Thanks, Stefan. 2015-07-29 17:46 GMT+09:00 Stefan Hajnoczi <stefa...@gmail.com>: > > You should probably use qcow2 backing files instead: > > 10G.qcow2 <-- vm001.qcow2 > ^-- vm002.qcow2 > > The command to create these files is: > > qemu-img create -f qcow2 -o backing_file=10G.qcow2 vm001.qcow2. > > Both VMs share the data in 10G.qcow2. All writes go to vm001.qcow2 or > vm002.qcow2, respectively, so they don't corrupt each other. >
I tried to create a backing files, using the commands which you told. $ qemu-img create -f qcow2 -o backing_file=10G.qcow2 vm001.qcow2 $ qemu-img create -f qcow2 -o backing_file=10G.qcow2 vm002.qcow2 And, I used these backing files on each virtual machines. But, new files weren't written on original disk image(10G.qcow2).. The backing files were working each other. > Standard file systems (ext4, xfs) and volume managers (LVM) are not > cluster-aware by default. They must only be accessed from one machine > at a time. Otherwise you risk data corruption. > I think that I must probably use a shared file system like NFS..
