High Availability is not Redundancy
This is about the “A” in the CIA triad of security: Confidentiality, Integrity, Availability Just recently I was a witness of an incident where the failure of a perceived redundant system caused an outage of more than 5 hours of the central IT services of a multinational/intercontinental enterprise. Vital services like VoIP calls and conference bridges (which were interrupted with high profile customers) , SAP, e-mail, central file services, CAD, order processing, printing of delivery notes and therefore loading of trucks, processing of EDIFACT-based orders and invoices, etc. were unavailable for most of the 20.000 employees and customers worldwide during this black-out. What happened? Some when in the morning we noticed a lot of commotion in the department (open plan office) and quite soon it was obvious that all network based services were out
