Dell Compellent Series 40 - Manual (Page 292)

284 Storage Center 5.5 System Manager User Guide
Data Instant Replay
Introduction
Data Instant Replay is a separately licensed Storage Center application.
A Replay is a point-in-time copy of one or more volumes. Once an initial Replay of a volume
is taken, subsequent Replays preserve pointers to data that has changed since the
previous Replay. This minimizes the amount of storage space required to preserve periodic
copies of a volume.
Replay Profiles are a collection of rules describing when to take periodic Replays for one
or more volumes and how long before Replays are deleted (expired). A Replay Profile can
contain multiple rules. For example, a Replay Profile can require a Replay to be taken once
a day and once a week and once a month. More than one Replay Profile can be applied to
one or more volumes. Once a Replay Profile is applied to volumes, subsequent changes
to the Replay Profile are applied to all the volumes to which the Replay Profile is attached.
• Changes to the rules for taking a Replay only affect Replays taken in the future.
• Changes to the rules for expiring Replays go into effect immediately for all Replays
created by the Replay Profile.