3 ms·
Bandwidth isn’t the only constraint. You also have latency, finite write cycles, a minimum number of bytes that need to be rewritten at once. Also SSDs get thos
by ziml77 5y ago
Bandwidth isn’t the only constraint. You also have latency, finite write cycles, a minimum number of bytes that need to be rewritten at once. Also SSDs get those speeds by having onboard DRAM caches. That may not be the speed of the flash memory
- wtallis 5y ago> Also SSDs get those speeds by having onboard DRAM caches. Usually not. Most SSDs that have DRAM only use it to hold the address mapping tables, not any user data. The DRAM cache for that internal metadata helps with random IO performance (saving an extra flash read before the real IO can be done), but has minimal impact on sequential read throughput, which is what has actually reached 7+ GB/s.