Load Manager Rules Explained

This article contains information about Load Manager rules.

Load Manager Rules

The Advanced Load Manager feature included with MetaFrame Advanced Edition (XPa) and MetaFrame Enterprise Edition (XPe) allows administrators to combine individual rules into load evaluators for highly customized load management.

The following individual rules can be configured as part of a load evaluator:

Application User Load

This rule allows the load evaluator to calculate a load based on the number of users accessing a specific published application on the attached server.
When the number of users accessing the published application is less than or equal to the threshold value indicated here, Load Manager reports a load percentage based on the threshold value.
The valid range for this rule is 1 to 10000.??

Context Switches

This rule allows the load evaluator to calculate a load based on the CPU context switches. A context switch occurs every time the operating system switches from one executing process to another.

• When the CPU context switches are within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

• When the CPU context switches?? exceed the high threshold, Load Manager reports full load.

• When the CPU context switches?? are less than the low threshold, Load Manager reports no load.

The valid range for the high and low thresholds is 0 to 2147483647.

CPU Utilization

?? This rule allows the load evaluator to calculate a load based on CPU utilization.

• When the CPU utilization?? is within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

• When the CPU utilization exceeds the high threshold, Load Manager reports full load.

• When the CPU utilization is less than the low threshold, Load Manager reports no load.

The valid range for the high and low thresholds is 0 to 100.

Disk Data I/O

This rule allows the load evaluator to calculate (in kilobytes) a load based on the disk I/O throughput.

• When the disk I/O throughput is within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

• When the disk I/O throughput exceeds the high threshold, Load Manager reports full load.

• When the disk I/O throughput is less than the low threshold, Load Manager reports no load.

The valid range for the high and low thresholds is 0 to 2147483647.

Disk Operations

?? This rule allows the load evaluator to calculate a load based on the number of disk operations per second.

• When the number of disk operations per second is within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

• When the number of disk operations per second exceed the high threshold, Load Manager reports full load.

• When the number of disk operations per second are less than the low threshold, Load Manager reports no load.

The valid range for the high and low thresholds is 0 to 2147483647.

IP Range

This rule allows the load evaluator to enable or disable access to a published application based on whether the IP addresses of the ICA Clients are within the specified IP address ranges

Formula for matching clients with the specified ranges:

If the IP address of the ICA Client is greater than or equal to the specified [Starting IP Address] AND the IP address of the ICA Client is less than or equal to the specified [Ending IP Address], the client is considered to be a part of the specified range and action is taken depending on the inclusion or exclusion mode.
Use this rule in conjunction with another rule. This rule will not load balance connections by itself.

License Threshold

This rule allows the load evaluator to calculate a load based on the number of assigned or pooled connection licenses used on each server.

• When the number of connection licenses in use is less than or equal to the thresholds, Load Manager reports a load percentage based on the threshold values.

• When the number of connection licenses in use exceeds the high threshold, Load Manager reports full load.

To indicate that a license type is to be ignored, enter zero for the license type. You can enter zero for only one of the license types.
The valid range for the high threshold is 0 to 9999.

Memory Usage

This rule allows the load evaluator to calculate a load based on memory utilization.

• When the memory utilization is within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

• When the memory utilization exceeds the high threshold, Load Manager reports full load.

• When the memory utilization is less than the low threshold, Load Manager reports no load.

The valid range for the high and low thresholds is 0 to 100.

Page Fault

This rule allows the load evaluator to calculate a load based on the number of page faults per second. A page fault occurs every time the operating system accesses physical memory that has been flushed to disk.

When the number of page faults per second is within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

When the number of page faults per second exceeds the high threshold, Load Manager reports full load. When the number of page faults per second is less than the low threshold, Load Manager reports no load.
The valid range for the high and low thresholds is 0 to 2147483647.

Page Swap

This rule allows the load evaluator to calculate a load based on the number of page swaps per second. A page swap occurs every time the operating system swaps physical memory to virtual memory on disk.

• When the number of page swaps per second is within the low and high thresholds, Load Manager reports a load percentage based on the threshold values.

• When the number of page swaps per second exceeds the high threshold, Load Manager reports full load.

• When the number of page swaps per second is less than the low threshold, Load Manager reports no load.

The valid range for the high and low thresholds is 0 to 214748364.

Scheduling

This rule allows the load evaluator to enable and disable availability of a server or published application during certain days of the week and certain hours of the day.
The squares are indicated in half hour time blocks. Filled squares are enabled and white squares are disabled.

• When the time and day of the week are within the specified time, Load Manager reports no load.

• When the time and day of the week are outside the specified time, Load Manager reports full load.

Use this rule in conjunction with another rule. This rule will not load balance connections by itself.
For example:

The following output displays the first connection with the default load evaluator:

C:\>qfarm /load
Server?? Name?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? Server?? Load
--------------------?? ?? ------------
FTLRDRINEHAR11?? ?? ?? ?? ?? ?? ?? ?? 100

The following output displays the second connection with the default load evaluator:

C:\>qfarm /load
Server?? Name?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? Server?? Load
--------------------?? ?? ------------
FTLRDRINEHAR11?? ?? ?? ?? ?? ?? ?? ?? 200

The following output was displayed with just the Scheduling load evaluator rule. The two (2) original connections were still active:

C:\>qfarm /load
Server?? Name?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? Server?? Load
--------------------?? ?? ------------
FTLRDRINEHAR11?? ?? ?? ?? ?? ?? ?? ?? 0

The following output was displayed after applying the Server User Load and Scheduling load evaluator rules. The two (2) original connections were still active (this is the expected result until 6 P.M when the server is still available).

C:\>qfarm /load??
Server?? Name?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? Server?? Load
--------------------?? ?? ------------
FTLRDRINEHAR11?? ?? ?? ?? ?? ?? ?? ?? 200

The following output was displayed after applying the Server User Load and Scheduling load evaluator rules. The two (2) original connections were still active (this is the expected result after 6 P.M when the server is unavailable).

C:\Documents and Settings\Administrator.UOFM>qfarm /load
Server?? Name?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? Server?? Load
--------------------?? ?? ------------
FTLRDRINEHAR11?? ?? ?? ?? ?? ?? ?? ?? 10000

Server User Load

This rule allows the load evaluator to calculate a load based on the number of users on an attached server.

• When the number of users is less than or equal to the high threshold, Load Manager reports a load percentage based on the threshold value.

• When the number of users exceeds the high threshold, Load Manager reports full load.

The valid range for the high threshold is 1 to 10000.

Additional Resources

CTX112082 –?? Troubleshooting Load Balancing Issues