Explanation/Reference:
Explanation:
Snapshots are point-in-time copies of volumes that capture the contents of a volume at a specific point in time and are often used to recover data lost by events such as human error, viruses, or database corruption.
When a snapshot is created, it does not consume any space, but instead is only a set of pointers to the data in the base volume.
References: Dell PS Series Snapshots and Clones: Best Practices and Sizing Guidelines, page 9
http://en.community.dell.com/dell-groups/dtcmedia/m/mediagallery/20097871/download