Disk arrays are groups of disks that work together with a specialized array controller to take advantage of potentially higher data transfer rates and data redundancy.
Disk arrays use RAID technology to offer data redundancy and to provide improved data transfer rates over single large disks. If a disk failure occurs, the disk can typically be replaced without interrupting normal system operation.
The disk array controller tracks how the data is distributed across the disks. RAID 5 and RAID 6 disk arrays provide data redundancy, ensuring that data is not lost if a disk in the array fails. If a disk failure occurs, the disk can typically be replaced without interrupting normal system operations. System mirroring provides data redundancy by mirroring the same data across pairs of disks.
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