Chapter 1
CPU load
When this rule is applied, MetaFrame XP will
refuse more logons when the CPU is busy more
than 90 percent of the time and report the server as
free when it’s busy less than 10 percent of the time.
Disk Data I/O Measures how often the disk reads or writes data.
Disk Operations
Measures how many reads and writes a disk is
doing per second. As with Disk Data I/O, this rule
applies to all the disks on a terminal server—it’s not
specific to individual disks.
IP Range
Permits or disallows connections to servers or
applications from the range of addresses you
supply.
License Threshold
Keeps track of the number of licenses (pooled or
assigned) that are being used on a particular
server. Assigned licenses are specific to a server;
pooled licenses are shared among all the servers in
a farm.
Memory Usage
Reports the percentage of memory that’s in use on
a server.
Page Fault
Keeps track of the rate at which the server
performs page faults (accesses data that’s been
swapped from memory to hard disk).
Page Swap
Monitors the rate at which the server swaps data
from memory to hard disk.
Scheduling
Allows you to choose times of day or days of the
week when a server or application isn’t available.
This rule isn’t meant to be used in isolation and
won’t kick off users who are using the application
when it’s gone into the “blackout” time.
Server User Load
Keeps track of the number of connections and
refuses new connections if the current limit is at the
upper threshold.
Table 1.4: MetaFrame XP’s available load-balancing rules.
MetaFrame XP comes with two sets of load evaluators: Default and Advanced. If you install
MetaFrame XP in native mode (so that it can communicate only with other MetaFrame XP
servers), it will use the Advanced evaluator, which measures server stress according to the
number of page swaps the server is doing per second and its memory and CPU utilization load. If
you’ve got the server set up to work with MetaFrame 1.8 servers (I’ll provide more information
about this setup shortly), it will use the Default load evaluator, which just measures the current
connections to the MetaFrame server. You can build your own load evaluator by selecting
Actions, New when you’re in the Load Evaluator section of the console or by clicking the menu
button with the green cross on it. Alternatively, you can copy an existing load evaluator and edit
the copy—you can’t edit the built-in evaluators. You can only apply one load evaluator to a
server at a time.
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