IBM Midrange System DS4000 Series Hardware Manual page 523

A
Overview of IBM System Storage
Appendix A.
DS5000 RAID types
In this appendix, we explain the various RAID levels that you can configure when setting up
disk arrays on the DS5000 storage subsystems. RAID is an acronym for Redundant Array of
Independent Disks. Therefore, the basic structure of RAID is an array of disk drives.
The array is a collection of drives that is configured, formatted, and managed in a particular
way. The number of drives in the array, and the way that data is split between them, is what
determines the RAID level, the capacity of the array, and its overall performance and data
protection characteristics. Deciding what types of arrays to set up, and how to configure them,
is the first thing you do when setting up a RAID implementation.
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