I currently manage a single server install on an ESX host using SATA SAN storage. We support approximately 8000 accounts (6000 have logged in within the last 90 days). We've begun to experience some issues with sluggishness both on the web UI and command line management.
I was hoping for some input as to whether or not we should be considering a multi-server install at this point. Where are the general recommended cutoff points for adding more servers to an install? Our accounts aren't used terribly heavily (they are students, not business users).
Thanks for any advice.