Inside System Storage -- by Tony Pearson

Tony Pearson Tony Pearson is a Master Inventor and Senior IT Specialist for the IBM System Storage product line at the IBM Executive Briefing Center in Tucson Arizona, and featured contributor to IBM's developerWorks. In 2011, Tony celebrated his 25th year anniversary with IBM Storage on the same day as the IBM's Centennial. He is author of the Inside System Storage series of books. This blog is for the open exchange of ideas relating to storage and storage networking hardware, software and services. You can also follow him on Twitter @az990tony.
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Tony -<div>&nbsp;</div> How can you claim that the 450 GB drives are as fast or faster than the 300 GB drives and then conclude that capacity/performance trade-offs don't matter?? I checked HGST drive specs, the 300 and 450s have identical buffer sizes, latency and seek times. I think each drive can sustain just under 180 IOPS per drive (clear this up for me if I have missed something) and that the capacity/performance trade-off is alive and well. Is there some magic that happens inside a DS6800 or DS8000 that allow a 450 GB drive to handle more IOPS than a 300 GB drive?

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Chuck,I compared Seagate models based on their DDM speeds, I had not looked at the HGST, but glad to hear that their 450GB are as fast as their 300GB also. The magic caching algorithms and design features in the DS6800 and DS8000 apply to both types of drive. Depending on the workload, these higher capacity drives could therefore help deliver the same or more IOPS and MB/sec throughput as the 300GB drives. I have updated to show the numbers I used for the comparison to clarify.<div>&nbsp;</div> I have also clarified the Incremental Resync paragraph.-- Tony

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