this post was submitted on 14 Dec 2025
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Indeed.
It's standard distributed systems design to have a hierarchy of storage with different speeds whose contents is allocated based on the frequency with which certain data is accessed, and HDDs are really only good for bulk data which is seldom accessed (basically the speed category for long term storage with low wait times when it does get needed but not really meant to be constantly accessed, which is just above things like tapes and other backup storage methods).
So for example for a dynamic website with thousands of users most current data should be in SSDs and HDDs would maybe contain low access info such as historical data from the last couple of years and in front of those SSDs there would be a ton of memory to serve as a cache for the most accessed of all data (say, the CSS, JS and images of the home page) as in-memory data is even faster to access than data in an SSD.
The idea that SSDs aren't useful for servers is hilarious ignorant.