Best practices to improve storage availability or performance with RAID

What are some of the best practices to create data redundancy and to improve storage performance?

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Performance and redundancy are build into our storage architecture. We store data in parallel, in two separate zones within each geographical location. The reliability and security would improve very little via the use of a mirror of mass storage devices such as a RAID 1. Striping with RAID 0, or the combination of increased security and access speed through RAID 5, would also have an very little significance, and the same thing applies for a DRBD device. If you wish to increase data integrity, you can use a file system like ZFS.