Which questions can I ask here? DB administrators, are they coders or just people who simply install the SQL server and make sure that it has no viruses, is up and running? I actually wanted to ask a low-level question, basically, how persistence is ensured/assumed? When does the server does the flush? Can it happen that OS flush command propagates into some intermediate buffer and does not propagate down to the HDD plates? Today, many storage manufacturers and interfaces support out-of-order write buffers. What are implications? Should you take any action to counteract it? Does ram buffer on disk matter? Are any UPS (and which) required to support the RAM buffer? Are there any courses that teach safe storage?
What should I guarantee if I have my own "DB" - storing my data in plain files? I mean that DB does the best, what is the best so that I could guarantee that data is not lost.
These are pretty low-level questions and I am not sure if asking them from administrators is a proper idea. On the other hand, even if you is user rather than DB designer, you must know what are the OS and hard drive requirements.