Guest post by John Barnard, CTO, Mainframe Service Management
The mainframe has changed – a lot – since the 1970s. It has evolved from machines with one or two CPUs with minimal storage and fixed partitions to scores of central processors, huge DASD farms, and multiple virtual systems running simultaneously. Tasks that were once manual are now automated. Data that was once entered on punch cards can come from smart phones.
During the disco years, we submitted jobs and hoped for the best. A green light indicated that a job completed successfully, and a system dump indicated that it did not. Monitoring was done after the fact. Now we can view transactions as they flow across environment, enabling us to be more proactive and to prevent problems.