Benefits – Simplicity, Service, Savings
In a large, complex z/OS datacenter with many mainframes and other demands on your time, it might be tough to ensure you are setting your Defined Capacity (DC) properly (smaller shops, on the other hand, may find it practical to hand-tune). To really push the limits, and save the maximum amount possible, it is virtually impossible to audit and manage your DC settings as well as you would need to at the frequency that would make a real difference.
The key is to ensure that less time-critical workloads are held back to protect the more critical online workloads (OLTP). While that sounds simple, in the dynamic world of managing the rolling four-hour average (R4HA), no person can really predict what might change, let alone plan for it.
ThruPut Manager, utilizing ACM, automatically monitors the R4HA and as it approaches a peak (or the threshold you set) defers selection of the batch workload, lowest priority first. When the peak passes, it resumes selecting the deferred workload. If your peaks occur at month-end, the automated deferral of low importance work would only take place during that time. With ThruPut Manager automation, your highest peak for the month is lowered resulting in lower monthly charges, all without affecting your online workload or higher priority batch.
ACM adds more criteria to the job selection decisions being made by ThruPut Manager. With ACM configured and active, ThruPut Manager is in a unique position to automatically control batch workload by taking into account the value of the R4HA relative to the limit, providing real savings on monthly software license fees.
By reducing the contribution of low importance batch load to the R4HA, Automated Capacity Management reduces the negative effects of soft capping and makes it possible to implement Defined Capacity and/or LPAR Group Limits or reduce current limit values, resulting in lower monthly software costs while maintaining online response times and the required throughput for high importance batch workloads.
At the same time, because ACM is constantly monitoring the R4HA and current demand, it will still provide the best service possible to low importance load under the circumstances by relaxing constraints as soon as the peak value of the R4HA will no longer be affected.
Installations that were hesitant to implement soft capping due to possible negative effects can now go ahead and reap not only the savings that soft capping itself provides but also the increased savings made possible by ACM. For those installations in which there remain disadvantages to implementing capping, ACM can still reduce consumption without impacting service levels, all while continuing to meet SLA targets.
Since charges for every license on a CPC are based on the highest Rolling 4-Hour Average (R4HA) for the month, the key to reducing your MLC costs is to keep the highest monthly peak as low as possible. In addition to managing costs, you must also meet the needs of your organization, so your online systems and critical batch production must not be impacted.
With ThruPut Manager automation, your highest peak for the month is lowered, resulting in lower monthly charges, all without affecting your online workload or higher priority batch.