3 ms·
"which combines the performance of SSDs with the capacity of tape" more BS coming out of China
by knowitnone 2y ago
"which combines the performance of SSDs with the capacity of tape" more BS coming out of China
- 082349872349872 2y agoThe amount of BS could range from none to complete; it all depends upon your access pattern. (my workload has heavy recent locality, so I could probably even live with Jim Gray's predicted combination of main memory + tape; where the SSD buffer would come in handy during reboots) What does JNG's five-minute rule suggest for lifetimes and xfer sizes in 2024? https://www.cs.cmu.edu/~natassa/courses/15-721/papers/gray.pdf https://www.cs.cmu.edu/~natassa/courses/15-721/papers/gray.p... (1997) EDIT: with an SSD at 40k iops @ 100 USD and 4k pages: (256 pages/MB) / (40000 io/s) * (100 USD) / (1e-6 USD/MB) ~= 1 week / io Randomly Accessed Objects => 1 week rule assuming sequential b/W at 6 GB/sec: (1 / 6000 MB/sec) * (100 USD) / (1e-6 USD/MB) ~= 5 hours Sequentially Accessed Objects => 5 hour rule I'll let someone else do the index calcs, but clearly we're no longer in a world where secondary swap makes any sense during typical user process lifetimes.