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Re: [ARSCLIST] Hard disk drives and DAT

At 08:27 PM 2007-03-27, Eric Jacobs wrote:
I've been following this thread closely, and think a valuable
exercise would be to create detailed cost models for different
storage scenarios.  Scenarios might include:

   - Hard disk on a shelf
   - Optical media (gold CD-R, DVD-R, Blue Ray)
   - Managed storage (mirrored on-line storage, tape back-up)

Common to each storage scenario:

   - Model three different size collections (1 TB, 10 TB, 50 TB)
   - Model a 50-year or 100-year life cycle
   - Make reasonable assumptions for media checking, refreshing,
     migration, and physical storage
   - Make assumptions about density and technology evolution
     (Moore's law-ish)

Maybe there are other storage scenarios to be considered, and
other details to be considered, but you get the idea.

Good idea, but it's daunting, really and there are so many variables. I could see this taking a couple of days to even get a first approximation for ten years. It is also interesting to extend this into the petabyte region for the video and film people.

Things to consider when you crunch this:
(1) For the optical media solution you need to take into account storage space.
(2) For the hard drives on the shelf, consider the "Active Shelf" appliance that has
e-SATA ports every inch or so that actually connects to the drives and lets
you access them. Jim Wheeler and I have been discussing this off-list.
(3) Consider power consumption.

All factors to consider.



Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.

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