Re: 1 TB _a day_ at CERN (was: 21 terabytes at NYNEX)

Sorry, I forgot. The expected data rates are more like 10 TB/day for two of the experiments (ATLAS, CMS), and 150 TB/day for one of the others (ALICE). But again, not for a little while yet...

Juergen Schlegelmilch wrote:
>
> On Sun, 26 May 1996 11:16:50 +0100, Akmal B Chaudhri <akmal_at_sarc.city.ac.uk> wrote:
> >
> > I think the tape robots would be the standard way to put such large
> > quantities of data on-line, as you rightly suggest. I believe CERN are
> > looking into various mass-storage technologies to interface with an OODB
> > for the longer-term. I have no idea about disk requirements, though. Even
> > if anyone wanted to put such large quatities on disks, it would probably
> > cost such an enormous amount of money to do so that I guess practically
> > nobody (except maybe the US military) could afford it. Also, I don't see
> > how disk technology is really going to improve that much over the time
> > that they want to conduct these tests.
>
> Just yesterday I heard in an Objectivity RoadShow a talk from Jamie Shier
> from CERN about this project (its name is rd45; sorry, there is a WWW page
> with exact info but I did not write down its URL). They plan to use clusters
> of machines running Objectivity, and believe that tapes are obsolete by that
> time, i.e. will only use hard discs. Regarding the money: The price for
> discs has dropped significantly over the last few months, and competition
> will further put pressure on it; and compared to the cost for their physics
> equipment are hard discs inexpensive, I believe.
>
> Regards,
> Juergen
>
> --
> +-----------------------------------------------------------------------------+
> Dipl.-Inf. Juergen Schlegelmilch University of Rostock
> email: schlegel_at_Informatik.Uni-Rostock.de Computer Science Department
> http://www.informatik.uni-rostock.de/~schlegel Database Research Group
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-- 
Jamie