Messages in this thread | | | Date | Mon, 09 Apr 2007 16:47:10 -0400 | From | Jeff Garzik <> | Subject | Re: I give up |
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Valdis.Kletnieks@vt.edu 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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