A Global Survey Reveals Companies at Risk From Inadequate Planning for Generational Shift in Mainframe Stewardship. A survey of 350 CIOs regarding the use and management of mainframe hardware and software in the enterprise uncovered a profound disconnect between the continued importance of the mainframe to the business and the actions CIOs are taking to protect their investments in the platform. Despite the central role the mainframe continues to play in the digital enterprise, the survey reveals that inadequate investment in the mainframe is putting companies at risk in multiple ways.