8.1 Introduction

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8.1 Introduction

There are many exploiters of System Logger. As discussed in Chapter 1, "Introduction to System Logger" on page 1, some of these predominately only write to System Logger, with very infrequent reading back of that information (the "funnel-type" exploiters). And others use the log stream data much more actively (the "active" exploiters). In addition, some exploiters write large volumes of data to System Logger, while others only write infrequently. However, because the process of writing data to System Logger is a synchronous one, it is important to all exploiters that System Logger provides good performance.

In addition, the two types of users have different requirements of System Logger. The funnel-type exploiter is mainly concerned that the log stream never fills up, and that offloads happen as efficiently as possible. The active exploiters ideally want all their data to always reside in the interim storage, with few, if any, log records being moved out to offload data sets before they are deleted.

Beyond the considerations that are unique to one or other type of exploiter, there are some general recommendations that apply to both. We discuss these in this chapter as well.

And finally, if you are to undertake an exercise to investigate and possibly tune the performance of System Logger, you must be familiar with the information provided in the SMF Type 88 records, and how best to access that information.

The following sections provide recommendations to help you set up an efficient and highly-available System Logger environment. Note, however, that some of these recommendations may be different for specific exploiters; in that case, the recommendations provided in each exploiter chapter (Chapter 3 through Chapter 6) will override the recommendations we make here.



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Systems Programmer's Guide to--Z. OS System Logger
ASP.NET for Web Designers
ISBN: 738489433
EAN: 2147483647
Year: 2002
Pages: 99
Authors: Peter Ladka

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