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IBM System Storage N series Hardware Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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Data protection with RAID Double Parity
This chapter provides an overview of RAID Double Parity (RAID-DP) and explains how it dramatically increases the data fault tolerance of various disk failure scenarios. Other key areas covered include cost information, special hardware requirements, creating RAID groups, and converting from RAID 4 to RAID-DP.
This chapter includes a double-disk failure recovery scenario. This scenario illustrates how RAID-DP ...

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