METHOD FOR MANAGING AND CONTROLLING TIME OF COMPUTER SYSTEM AND COMPUTER SYSTEM

摘要

In a time management control method of a computer system for managing each individual time of a plurality of virtual systems, a service processor retains an overall system time and a difference time between the overall system time and a virtual system time for each virtual system, and a firmware in the virtual system acquires the overall system time and the difference time, calculates a difference time between the overall system time and the change time of the virtual system, adds the both difference times, and informs the service processor. Accordingly, the virtual system time can be changed without time management hardware in each virtual system. Further, since service processor performs update processing only, it is also possible to prevent a time set error caused by delayed calculation processing etc.