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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6 localhost commented Trackback

BarryB,I don't understand the more than twice comment. Maximum usable for DS8000 is 448TB with 500GB drives, compared to 586TB that DMX-4 offers. That's only 30 percent more. Architecturally, DS8000 can address 8PB of data, and I agree I was not aware that DMX-4 was architecturally limited.

7 localhost commented Trackback

I acknowledge my mistake - my apologies. I wrote the "more than twice" and hit send before I remembered that the DS8000 doesn't support RAID-6. The current DMX-4 does indeed support only 30% more usable capacity than the current DS8000, and it does so using 1/2 as many disk drives.<div>&nbsp;</div> Architecturally, the DMX can also support multiple petabytes of data, it is the current hardware packaging that imposes the limit, as is also the case with the DS8000.<div>&nbsp;</div> But it really doesn't matter what the architecture COULD support now, does it? We're talking about what customers can buy today here, aren't we? <div>&nbsp;</div> And there's no denying that the DS8000 implementation supports less capacity today than the today's DMX, and that the DS8000 requires twice as many drives to reach the same amount of usable capacity than does the DMX. As an added benefit, that makes the DMX inarguably the watts/GB "greener" solution.

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