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Storage Networking Fundamentals: An Introduction to Storage Devices, Subsystems, Applications, Management, and Filing Systems by Marc Farley

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Avoiding Parity Limitations of RAID with RAID 10

RAID 10, also called RAID 0+1, is not one of the original defined RAID levels, but it is extremely effective and in many ways is superior to RAID 5, except for the capacity required. RAID 10 combines the mirroring of RAID 1 with the striping of RAID 0.

In essence, RAID 10 mirrors every member in a RAID 0 array. Thus, RAID 10 removes the RAID 5 write penalty from the equation and also provides much more redundancy depth than RAID 5. A RAID 10 array can lose more than two members and still continue to operate, as long as it does not lose both pairs of a mirrored member. Figure 9-6 shows a RAID 10 array made up of four mirrored pairs.

Figure 9-6. A RAID 10 Array with Four Mirrored Pairs

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