Systems Architecture 6th Edition by Stephen Burd

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You have six 1 TB disks for assembling a RAID storage array and are considering RAID levels 0, 5, 6, and 10 for the array. For each level, what s the effective data storage capacity, and how many disks can fail before data is lost permanently? Which level would you recommend for an array holding data for a Web site that s changed infrequently and backed up daily? Which would you recommend for an array holding transaction data for an e-commerce site that s backed up daily?