9.1.1 Adding Performance Counters
To monitor the performance of an object, you must add the appropriate counter that is relevant to the aspects
of the object you want to monitor. To add counters to an object in System Monitor, do the following:
• Click on the
• Point to
• Click on
• Click on
• In the console tree, click
• Right-click anywhere in the Details pane
• On the pop-up menu, click
• In the Performance Object drop-down box, select the
for which you want to
• Select the appropriate
from the list
• When you have selected the desired objects and counters, click
TABLE 9.1: Some Useful Performance Counters
Memory: Available Bytes The amount of physical memory, in bytes, available to
processes running on the computer. If this is less than
4MB, check for memory leaks and add RAM if necessary.
The rate at which pages are read from or written to disk to
resolve hard page faults. This counter is a primary
indicator of the kinds of faults that cause system-wide
delays. If more than 20, investigate paging settings.
Paging File: % Usage
The amount of the Page File instance in use in percent.
The Paging File value should match up with the previous
two values. A value exceeding 70 percent is not healthy
for the system.
PhysicalDisk: Avg. Disk
The average number of both read and write requests that
were queued for the selected disk during the sample
interval. A count of up to 2 is acceptable.
Logical Disk: Free Megabytes The unallocated space, in megabytes, on the disk drive. If
below 15% of the total disk size, clear more disk space or
increase logical disk space.
Physical Disk: %Disk Time,
Logical Disk: %Disk Time
The percentage of time that the selected disk drive was
busy servicing read or write requests. If consistently
above 90%, the disk is not being read quickly enough.
This could be a hardware issue. It could also be that the
amount of data on the disk is too large.
Processor: % Processor Time The percentage of elapsed time that the processor spends
to execute a non-Idle thread. If consistently above 80%,
find the process-intensive processes and move them to
separate processors or add adding another processor or by
upgrading to a faster processor.
The average rate, in incidents per second, at which the
processor received and serviced hardware interrupts. If
the counter value increases without additional processes,
the cause could be hardware related.
Server: Bytes Total/sec
The number of bytes the server has sent to and received
from the network. If all your servers’ Bytes Total/sec is
the same and similar to the maximum network speed, you
might need to increase the network bandwidth.
Server: Pool Paged Peak
The maximum number of bytes of paged pool the server
has had allocated. This indicates the proper sizes of the
Page File(s) and physical memory. This counter should
not be greater than the physical RAM value. If it is, add