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Make possible to store snapshots not in /tmp directory
Add option libvirt_snapshots_directory which specifies path where snapshots will be stored before libvirt driver uploads them to the image service. VM disk snapshot can be quite large, so keeping them in /tmp is not desirable. Fedora 18 will move /tmp to tmpfs in RAM, so snapshot functionality will become unusable with current nova behavior. Default path for snapshots directory is set to $instances_path/snapshots in this patch. In case, when shared filesystem is used to hold instances, option value can be adjusted to improve performance. Change-Id: I9458a2a26a619a01fa1ddb6955c0220ca747e64d
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