IBM SG24-4763-00 manual Hard Disk Bottlenecks, Monitoring Percentage Memory Use

This soft copy for use by IBM employees only.

Memory Usage in Figure 117 on page 140 is the usage of the total amount of memory available.

Figure 117. Monitoring Percentage Memory Use

Note

SQL Server and Sybase have parameters that can be set to limit the amount of memory used by these products. Thus, upgrading memory but not changing these parameters might not produce the desired performance increase.

8.6 Hard Disk Bottlenecks

Hard disk bottlenecks are difficult to measure, but careful examination of the results from Performance Monitor and TME 10 NetFinity can aid in this process.

Note

By default, disk performance monitoring is not enabled by the operating system. Enable it by issuing the command DISKPERF -Yand rebooting the server. This monitoring will consume extra resources and should be turned off once your testing is complete. Disable monitoring with the command

DISKPERF -N.

8.6.1.1 Using TME 10 NetFinity

This section describes the use of TME 10 NetFinity′s System Monitor to monitor disk performance.

Figure 118. Monitoring Disk Workload with NetFinity

System Monitor, as shown in Figure 118 is useful for gaining a feel for the workload that each drive experiences. You will notice that each logical drive presented to the operating system will have a separate monitor.

140PC Server and Windows NT Integration Guide