[email protected] wrote:
On Mon, 09 Apr 2007 16:08:34 EDT, Jeff Garzik said:
With current hard drive prices (200GB @ US$55, 500GB @ US$120) you can
just keep buying hard drives :)
Surely tape price/GB is higher than hard drive price/GB...
Erm. No. We're in the middle of installing an StorageTek SL8500 for backups,
simply because an LTO3 tape holds 300G at a price point of $100 or so.
And there's no sane way to build a half-petabyte disk farm at that price.
(And yes, our tape backup service is well into the half-petabyte range, and
will probably shoot over that as soon as the SL8500 is in production and we
deal with all the backlogged requests for backup service).
Don't forget to factor in the cost of disk shelves, power, cooling, and all
that when you're building something to hold 2,500 200G drives. Oh. and
controllers. And machines to put the controllers in... and all the rest of it.
Who says you have to keep the hard drives plugged into a machine at all
times?
And remember - you *dont* want to be backing up critical data on the sort of
hard drives that cost $55 for 200G - you'll want multiple copies, probably
some RAID, etc etc.
The same can be said for tape. Anyone who only has a single tape backup
of critical data is an idiot. Plenty of war stories where such
scenarios go awry...
Jeff
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