IBM Certification Study Guide AIX Performance and System by IBM Redbooks
By IBM Redbooks
This IBM Redbook is designed as a examine consultant for execs wishing to organize for the AIX functionality and method Tuning certification examination as a specific process research that allows you to in achieving the IBM qualified complicated Technical professional - RS/6000 AIX certification.This IBM Redbook is designed to supply a mixture of thought and sensible adventure wanted for a basic realizing of the subject material. It additionally presents pattern questions that might assist in the assessment of non-public development and supply familiarity with the kinds of questions that may be encountered within the examination.
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Extra info for IBM Certification Study Guide AIX Performance and System Tuning
Example text
Each segment contains a specific set of information, as shown in Figure 7. Chapter 2. Performance tuning - getting started 29 Figure 7. VMM memory registers Each segment is further divided into 4069-byte pages of information. Each page sits on a 4 KB partition of the disk known as a slot. The VMM is responsible for allocating real memory page frames and resolving references to pages that are not currently in memory. In other words, when the system needs to reference a page that is not currently in memory, the VMM is responsible for finding and resolving the reference of the disk frame.
Performance tuning - getting started In this chapter, the following topics are covered: • Introduction to concepts and tools • Performance tuning flowchart In general, the performance tuning issues can be divided into two areas: • System management • Application development The application developer will usually view performance more from a user’s perspective than a system perspective, for example, the user response time and system interactions are the concerns addressed during the design phase, not the overall system performance.
The retrans column displays the number of times requests were retransmitted due to a time-out while waiting for a response. This situation is related to dropped UDP packets. If the retrans number consistently exceeds five percent of the total calls in column one, it indicates a problem with the server keeping up with demand. For more information on the nfsstat command, see Performance Management Guide and Commands Reference - Volume 4, SBOF-1877. 44 IBM Certification Study Guide AIX Performance and System Tuning When requiring a more detailed output, the netpmon command, a trace facility, is useful.