CSD/SSD TCP Interface

TCP Interface with SSDs on Servers

• Periodic "heartbeat" message used to detect down connection.
• "Session ID" negotiation message, in which client or server informs the other about its current time of day and last-used session number.
• "Free pages" message, used to explicitly tell server to free a specific page, all pages in a particular virtual unit, or all pages stored on behalf of this host.
• "Graceful disconnect" message, in which client or server nicely informs the other that they are shutting down the connection.