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Disk Arrays

A disk array is a configuration of disk drives that used to manage and distribute data   across the disks while providing fast access and data integrity.

Disk arrays contain the following major components:
SCSI bus 
Physical disks 
Disk array controllers
TeradataWiki-Teradata Disk Array

Teradata Database uses dual redundant disk array controllers for maximum availability and better performance.
Two disk array controllers provides one level of protection in case one controller fails, and provides parallelism for disk access.

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