[1] The following diagram explains the ideal environment for running the dual server Digi-CA™ Server Xp system. The Strong Room/locked server cabinet should be a secured with biometric access, ideally with two power supplies and two separate internet connections from two different providers. Access to this area should be restricted to Administrators only. Two trusted and approved Administrators should be present at all times when the area is being accessed.
Links:
[1] https://www.digi-sign.com/downloads/download.php?id=digi-ca-pdf