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2.34. Volume Status

When a snapshot operation is triggered by means of a recurring snapshot policy, a snapshot is skipped if a volume has remained inactive since its last snapshot was taken. A volume is considered to be inactive if it is either detached or attached to a VM that is not running. CloudStack ensures that at least one snapshot is taken since the volume last became inactive.
When a snapshot is taken manually, a snapshot is always created regardless of whether a volume has been active or not.