Air New Zealand has completed an overhaul of its data center infrastructure, moving its primary systems to a Gen-i data center in central Auckland and an IBM data center in the southern part of the city.

The announcement, released Monday, marks the end of a two-year infrastructure migration for the airline, which has suffered two major outages while IBM was hosting all of its systems. Move to the Gen-i data center started after the first outage in December 2009.

Following the second outage, which occurred about one year later, the company’s CEO Rob Fyfe made an angry statement about IBM, saying the company was too “slow to react to a catastrophic system failure”. Still, IBM announced in July 2011 that it had won another contract to provide services to the airline at one of its data centers.

Air New Zealand’s environment is replicated across the two sites, running in an active-active configuration, which enables instant failover in the event of an outage at one of the data centers.

The airline’s CFO Rob McDonald said the program included both moving existing and building some new infrastructure.

“The opportunity to build new core and shared infrastructure in advance of the migration also significantly de-risked the migration program of key systems into the new facilities and supported rigorous testing of the improved failover capability,” he said.

The company’s network was upgraded in the process, and a number of “high-severity” systems were re-architected to support the active-active configuration.