Monitoring and Support of Unreliable Services

This paper tackles selected problems related to the use of unreliable third-party software libraries or hardware when developing, monitoring and supporting large, mission critical service systems. It is based on experience gathered at the Institute of Computer Science, Masaryk University (ICS MU), while developing software applications working with third-party access control and security systems. The first question discussed is the architecture of the system dependent on unreliable software, the other is the monitoring infrastructure and support mechanisms to handle frequent problems.