On 07/19/2012 05:38 AM, lin tan wrote: > Hi, > > I faced two problems with the snapshot: > > First issue, I can use the snapshot functions via the virsh correctly such > as snapshot-list. So far, so good. > And when I removed the snapshot XML files from > /var/lib/libvirt/qemu/snapshot/**/, Ouch. You should never modify files in /var/lib/libvirt - they are internal only. If you want to remove a snapshot, you should do so through the public API (virsh snapshot-delete, in this case). > I don't see the snapshot of the Virtual > Machine any more. That's correct. No, it's sheer dumb luck. You mucked with libvirt's internal storage, so all bets are off. > But after I copying the XML files back, I can't see the the snapshot as > well. Only if I restart my laptop can I see them. You might also get lucky and see them by restarting just libvirtd, rather than your entire computer. > However, restarting is > what I want to avoid. Because I wish I could utilize the functions in a > server in the future. > Does anyone have ideas about this, Did I do something wrong or it's a > limitation. What are you really trying to do? Then we can tell you how to do it using the APIs instead of mucking around with files behind libvirt's back. > So far, I am using the qemu-img command to check the snapshot and do the > revert without restarting my laptop. Because the snapshots are already > embedded in the img file. > > Second issue, I find if I create the XML file of snapshot by using > getXMLDesc and output to a new file in python, there is a slightly > different. But, the new XML file can't be recognized even if I restart my > laptop. The new XML file miss the attribute <active> as far as I can see, > is it so important? The attribute <active> is an internal-only detail, it only shows up in the /var/lib/libvirt locations because that is where libvirt stores internal-only information. You should never directly manipulate it. Instead, if you want to reinstate XML for a snapshot description after having previously erased that metadata, the correct approach is: virsh snapshot-create $dom $file --redefine [--current] where the optional use of --current will control whether /var/lib/libvirt sets the <active> internal element to 0 or 1. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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