Fast SSDs are getting cheaper every year, but they are still smaller and more expensive than traditional HDD drives. But HDDs have much higher latency and are easily saturated. However, we want to achieve low latency for the storage system, and a high capacity too.
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Last year marked a milestone in the world of Internet technology: the confirmation and standardization of HTTP/2. Popular web servers like Apache and Nginx already support HTTP/2, as do the latest versions of most browsers.
Data shows that by the middle of 2015, very few web sites and services had switched to HTTP/2, only 0.4%. The latest statistics (September 2016) show a significant increase: from 0.4 to 10%. It wouldn’t be that wild a prediction to say more and more sites are going to be making the switch and at a faster rate.