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Linux on IBM System Z: Performance Measurement and Tuning by Lydia Parziale

By Lydia Parziale

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Additional resources for Linux on IBM System Z: Performance Measurement and Tuning

Example text

Several improvements in z/VM storage management can be found release by release. Utilize the latest technology with higher performance. html Ensure that there are enough paging DASDs and that the paths to them are not very busy. This makes paging as fast as possible. Use multiple devices over as many DASD control units as it can to permit overlapped I/O. Use entire dedicated volumes for z/VM paging, instead of fractional volumes, that is, do not mix page spaces with other space (user, spool, tdisk, and so on), and make sure to define enough space so that you can do block paging.

Figure 3-23 z/VM-Planner graph of modeled system Please contact your IBM representative if you are interested in learning more about this tool. 3 is a PC-based performance modeling and capacity planning tool that runs on MicroSoft™ Windows™. It can be as portable as your PC or mobile computer. 3 is designed for system management on the IBM eServer™® zSeries® and S/390®®. With growing operating system complexity and the huge impact of responding to workload changes, basic Central Processor Unit (CPU) utilization is generally no longer sufficient information for performing capacity planning.

Usually, a system that is constrained by 2 GB has symptoms of high paging activities and a large amount of space in main storage above 2 GB. This can be determined by using CP INDICATE LOAD or CP QUERY FRAMES commands. The output of these commands may vary from release to release. For details about the commands and related output, refer to the z/VM CP Commands and Utilities Reference. The reason why all CP programs and data have to reside below 2 GB is because of CP’s address space. CP runs its own address space called system execution space (SXS), which can only be up to 2 G in size.

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