Lol. A stick of 256gb RAM costs ~$3000. 1TB needs 4. 1PB needs 4000. 10PB needs 40,000. So this would be an upfront cost of $120M.

And this doesn't even cover how you'd fit 40,000 sticks of RAM together.

10PB of RAM being only $120M blows my mind, to be honest. I would have guessed that price was closer to the SSD cost for 10PB.

This made me curious about what the SSD cost would be. It looks like you can get a 2TB SSD for $200. So that's $100/TB = $1M for 10PB. Of course prices may be higher for enterprise SSDs and you may need redundancy. Then again, you could probably get a bulk discount at that scale.

Tape is still very cost effective. Load latency might be a few minutes though