[tw04]

The price of disk has dropped at nearly the same pace as ram. As has the cost of compute. At the same time data growth has increased faster than either has dropped... so I'm not really sure the price argument holds water. If I can buy ram at 1/100th the cost but I need to store 500x more data... that isn't a net win on cost.

From ~$1000.00/gb to $0.03/gb

http://www.mkomo.com/cost-per-gigabyte-update

[runeks]

It would be interesting to see that chart updated to 2017 data. It appears the downward slope becomes significantly less steep around 2009 (looks like the price dropped as much from 2006-2008 as it did in the five years 2009-2014), and I’d be interested in seeing how recent SSD prices affect this. As far as I can see, rotational HDD technology is at the end of its S-curve, whereas SSD technology is still relatively new.

[notpeter]

Backblaze recently updated that data through Q2 2017 [1]. Hard drives have only dropped to $0.028/GB. For comparison SSDs are still ~$0.40/GB (~14x).

[1]: https://www.backblaze.com/blog/hard-drive-cost-per-gigabyte/

[2]: https://pcpartpicker.com/trends/internal-hard-drive/

[ksec]

Data Growth is faster then RAM price decrease, and at the moment it is actually increasing.

While I dont believe in Infinite growth of data, I still think a RAM only DB isn't as good if we have SSD that is ridiculously fast. My thinking is that RAM / SSD should always be 1:5 or 1:10.