match snaps to apps

Duzy, Glenn
December 2004
Storage Magazine;Dec2004, Vol. 3 Issue 10, p38
This article deals with the benefits that can be provided by snapshots across all types of applications and storage requirements. Snapshots can enhance and simplify the data recovery process by reducing recovery time and providing more recovery point objectives. But implementing snapshots requires planning and application analyses to determine what type of snapshot to use and how many to take. A snapshot is a point-in-time image of a collection of data. In general snapshots, can be broken into two types: full copy and differential copy. While most full copy snapshots use similar techniques there are several ways to implement differential snapshots, each with its advantages and disadvantages. The interesting thing about both techniques is that some of advantages are also disadvantages. With a full-copy snapshot, the entire contents of a data set are copied to a different set of spindles. Copying the data may be done on a continuous basis, so the creation of the actual snapshot can happen quickly. Simplified capacity management is another advantage of a full-copy snapshot. The disadvantage of using a completely separate set of spindles is the cost. Differential-copy snapshots only store changes to a file system. INSETS: Network Appliance goes virtual;Implementing snapshots for e-mail storage;Application integration enhances snapshot value.


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