| 摘要 |
An estimator program is disclosed which performs method steps for estimating the availability of an application program that runs on any computer in a cluster of at least two computers. By the availability of an application program is herein meant the probability that at any particular time instant, at least one of the computers in the cluster will actually be servicing requests from external workstations to use the application program. In one embodiment, the estimator program begins by receiving input parameters which include 1) multiple downtime periods for each computer in the cluster that occur at respective frequencies due to various downtime sources, and 2) an application failover time period for switching the running of the application program from any one computer to another. From those input parameters, the estimator program estimates first and second annual stoppage times, and then determines the availability of the application program on the cluster from the sum of the first and second annual stoppage times.
|
