Primer
Physical unit of flash memory
- Page
unit for read & write - Block
unit for erase
物理特性
- Erase before re-write
- Sequential write within a block
Cost: 17-32x more expensive per GB than disk
Optimal I/O for SSD
- I/O request size越好越好
- 要符号物理特性
- page or block对齐
- segmented sequential write within a block
http://codecapsule.com/2014/02/12/coding-for-ssds-part-6-a-summary-what-every-programmer-should-know-about-solid-state-drives/
http://www.open-open.com/lib/view/open1423106687217.html