About types of disk array methods
Two types of snapshots are designed for each supported disk array. One type creates a full-sized, fully allocated copy (a clone or mirror). Another type uses a copy-on-write system, which is not a full copy and saves disk space. The methods go by various names, depending on the disk array vendor.
All methods are listed in the following topic.
See Disk array methods at a glance.
Note:
Some disk array vendors use the term snapshot to refer to a certain kind of point-in-time copy made by the array. In other chapters of this guide, however, snapshot refers more generally to all kinds of point-in-time copies, disk-array based or otherwise. Refer to your array documentation for the definition of array vendor terminology.