IntelliMagic Vision in GDPS Environments

Gilbert

By Gilbert Houtekamer, Ph.D.

GDPS is IBM’s most advanced Business Continuity solution for the zSeries platform. Its design leverages the availability of enough data processing components in multiple sites, such that IT services may continue even if one site suffers a complete failure. All critical data, disk or tape resident, is mirrored between sites using synchronous and/or asynchronous remote copy.

GDPS is about maximizing availability. However, as those in both performance and business can attest, availability is not always a binary event (such as a disaster). For example, if critical data is available on your Disk Subsystems but poor I/O response times are impacting your applications, are you meeting your availability objectives? The data storage and data replication involved in these types of environments is complex, and this is magnified by the difficulty of seeing how it is operating.

Continue reading

Dragging the Right Information Out of SMF/RMF/CMF for z/OS Disk Performance Analysis

Dave Heggen

By Dave HeggenDragging

Internal processing in IntelliMagic Vision is performed on a Sysplex Boundary. We want the SMF data from all LPARS in a Sysplex, and if multiple Sysplexes attach to the same hardware, then we want these Sysplexes together in the same interest group. By processing the data in this manner, an interest group will provide an accurate representation of the hardware’s perspective of activity and allow an evaluation of whether this activity is below, equal to, or above the hardware’s capability. It’s also true that the shorter the interval, the more accurate the data will be in showing peaks and lulls. The shortest interval you can define is 1 minute. This would typically be the average of 60 samples (1 cycle per second). It’s always a balancing act between the accuracy of the data and the size/cost of storing and processing the data.

Continue reading