← All posts tagged SSD

netneladno

Remember, adding more bits per cell reduces endurance and also increases program, erase and read latencies. In a Q&A session Samsung couldn't tell us any exact P/E cycle numbers, but they claimed that the 840 has higher endurance than many competitors MLC based SSDs. We didn't get more specifics than that, but we hope to be able to test this as soon as possible. As for the performance, Samsung again wouldn't tell us any raw latency numbers, but they said their TLC NAND is roughly 50% slower than their MLC NAND.

netneladno
SSD

Netflix was able to remove a memcached layer on 48 instances and replace it with 15 I/O instances with no intervening cache, while maintaining a lower overall latency. Using RAM to offload IO from the database was no longer necessary with the SSD backed Cassandra nodes and there was still plenty of CPU headroom remaining on the nodes.

netneladno
SSD

Не пройдет и трех лет, как скорости рандом доступа превзойдут скорость прокачки по сети, и кэш из оперативки переползет на диски. Потому как диски больше, а все так и так упрется в сеть.