
Chapter 6 Maintaining MetaFrame 137
Memory Load
To determine how much memory is present on the MetaFrame server, use the
Computer Management MMC as follows:
1. In the Administrative Tools group, click the Computer Management icon.
The Computer Management MMC appears.
2. Expand System Information and click System Summary. Memory statistics
appear in the right panel.
Pagefile.sys
Windows 2000 preallocates hard disk space for virtual memory. This area is
marked as a file called Pagefile.sys. In Windows 2000, the default pagefile size is
1.5 times the amount of physical memory. This value is determined during system
installation. The MetaFrame server can exceed the default size space if it is
determined that more memory is needed. However, this is time consuming and can
slow down the system.
Use Performance Monitor to monitor the demands on the pagefile. Check the
Commit Limit and the Committed Bytes counters under the Memory object to
determine how the pagefile is performing. When the Committed Bytes counter
exceeds the Commit Limit, increase the size of the pagefile as follows:
1. In Control Panel, double-click System.
2. Click the Advanced tab, then the Performance Options button.
3. Click the Change button in the Virtual Memory section, then enter new
Initial and Maximum sizes. Click Set and then click OK.
4. Click OK to exit.
Determine the optimum pagefile size by logging Committed Bytes over a period
of two weeks with Performance Monitor. Record the maximum value over the two
week period. Increase this number by 10% to 20% to determine the system’s
minimum pagefile size.
Memory Paging
Windows 2000 keeps the most used data in physical memory and pages the least
accessed data out to the pagefile. When a system is heavily loaded, memory is
paged in and out at a rapid rate. This affects system performance if the hardware is
unable to keep up with the server. The number of pages per second being paged in
and out of memory is a valuable indicator of hardware performance. The pages
per second should consistently average five or less per hard drive. If the pages per
second is constantly above five, the system is paging in and out of virtual memory
too much. Either use faster hard disks so the system can access virtual memory
quicker or add more RAM to the machine.
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