Questions on Hardware Requirements

I have a couple of questions that derive from reading the Hardware Recommendations documentation.

  1. wrt Database section, what is the definition of “large instance”?
  2. wrt SSD usage for improving ES performance, what would be the rule of thumb for sizing said SSD? I see that my SQ v7.2 test instance (8 projects and 327,000 LOC) only uses 49 MB for /es5/nodes