IBM SG24-4576-00 manual Performance Analysis Tools, DatagLANce

Figure 142. Differences in Disk Subsystems

Improving performance of the disk subsystem will usually prolong the maximum transactions per second rate shown in Figure 142. The effect of a faster disk can be to improve the disk cache hit rate. This is because write-data can be flushed from the cache quicker, so that the amount of memory available for caching of new data is increased.

5.2 Performance Analysis Tools

Using performance analysis tools is an effective method of understanding server performance.

5.2.1 DatagLANce

IBM DatagLANce is one such tool that can give valuable insight into server performance. DatagLANce operates at the physical layer and monitors the actual frames being transmitted on the network.

You can use the DatagLANce analyzer to get an accurate picture of the current activity on your network or a historical record of network activity over a specified period of time. You can design your own screens and save them from the menu. If you wish, you can create 32 different bar charts of real-time statistics, launch an analysis session and call up frame summary views, protocol interpreted views, and hexadecimal views (all color coded, highlighted, and tracked simultaneously). You can rearrange the statistics, add to them, and save them under a new name. You can use the DatagLANce analyzer′s alarms to let you know when certain statistical thresholds, such as network utilization, are reached. Since DatagLANce runs on top of OS/2, you can even use your machine for other applications while the analyzer is monitoring your network.

The following is a summary of DatagLANce features:

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88 source and destination address pairs filtered in real time Real-time frame capture while monitoring

Eight fast, super-powerful, programmable event detectors

172NetWare Integration Guide