On 07/10/2014 01:15 AM, hong-hua....@freescale.com wrote: > Hi, > > What's the difference between QEMU snapshot and libvirt snapshot? > > # qemu-img create -f qcow2 disk.img 512 > Formatting 'disk.img', fmt=qcow2 size=512 encryption=off cluster_size=65536 > lazy_refcounts=off
This created an offline internal snapshot. You can do the same with libvirt (which basically calls qemu-img under the hood for an offline guest). > > Is there any special qemu command options or kernel configurations to allow > libvirt create snapshot? No, if you are using libvirt to create the snapshot, then it should just work, provided you used libvirt correctly. > > I got the error as below: > > virsh # snapshot-create snap > error: unsupported configuration: internal snapshots and checkpoints require > all disks to be selected for snapshot This says to create a default snapshot of the domain named 'snap'; since you didn't specify any xml file, that default implies an internal snapshot. Is your guest running or offline at the time you attempted this? > # cat sdk.xml > <domain type='kvm'> ... > <devices> > <emulator>/usr/bin/qemu-system-ppc</emulator> > <controller type='usb' index='0'/> > <controller type='pci' index='0' model='pci-root'/> What? No <disk> element? You have to have a qcow2 disk associated with your domain before you can create an internal snapshot, regardless of whether the guest is online or offline. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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