Twelve Disks Of Parity
A storage array has 12 disks in RAID-5. Each disk is 4 TB and sustains 180 random 4 KB IOPS. The workload is 100 percent 4 KB random writes scattered across the volume, so no write ever covers a full stripe, and the controller uses the subtractive parity method.
What is the usable capacity, and what write IOPS can the array sustain for clients?
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