On 09/02/2015 04:23 PM, Jason Pyeron wrote: >> There are various solutions that CAN capture an accurate >> point-in-time disk snapshot. > > For cygwin/Windows use the Volume Shadow Service (VSS). I have used (XP) > cygwin dd and rsync to take (clone) images from the VSS managed drive.
What's more, if you are running your Windows machine as a virtual machine on top of qemu/kvm, you can install qemu-guest-agent into your Windows setup, and set things up so that when the hypervisor wants to take a snapshot of your guest, the guest-agent can coordinate with VSS to make the point in time correspond to completely stable I/O (all databases flushed and so forth, so the captured disk state is stable as if you had gracefully powered off) rather than just a random state of unflushed I/O (the disk state is as if you have yanked the power cord, and may have missing transactions; hope your file system had decent journaling if you wanted it to be consistent). -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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