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While tape has been the dominant storage medium for data protection for decades because of its low cost, it is steadily losing ground to disk-based deduplication storage systems. The CPU-centric design of EMC Data Domain systems takes the pressure off of disk I/O as a bottleneck. Over the last 20 years. CPUs have improved in speed by a factor of millions, while disks have improved by about lOx. It appears this performance gap will continue to grow well into the future. It is reasonable to imagine that each doubling of cores could mean Data Domain systems can improve speed by about 50 percent. In Stream-Informed Segment Layout (SISL), Data Domain has developed a proven architecture to deliver high-throughput deduplication storage systems with economical storage hardware.
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