Citrix Systems Citrix MetaFrame Application for Windows 1.8 - Manual (Page 119)

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u The maximum number of users the system can support.
The maximum number of users the system can support is the smaller of:
u The number of ICA connections per protocol. By default, the number of
ICA connections for each protocol is unlimited on MetaFrame servers and
two on W
IN F RAME servers.
u A user definable number. By default, the user definable number is simply
an arbitrarily large number.
Specify a maximum number of users when you have servers capable of handling
different numbers of users.
Suppose you have two servers, A and B. Testing shows that A can handle 100
concurrent users, while B can handle 50 concurrent users. By default, each server
would get an equal number of users logging in.
By setting server B’s User Load parameter at 50 and making the User Load
factor Very Important, you force that server’s user load calculation to be 100%
when 50 users are logged on. This keeps servers A and B balanced so that B does
not get more users than it can handle. At the same time A does not get fewer users
than it can handle.
Sessions that use RDP are not counted for the User Load calculations. If
you mix Citrix ICA and RDP connections, configure your servers to use advanced
factors such as Processor Usage and Memory Load to calculate load level.
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Pagefile Usage is calculated by taking the ratio of the current pagefile size to the
allowed minimum free space left in the pagefile. By default, the pagefile usage
load equals 100% when the pagefile has 500 bytes free.
Adjust the minimum amount of free space for the pagefile usage load calculation
in the Assume load is at 100% when the pagefile has only x bytes left box.
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There may be situations where other factors besides User Load are helpful in
calculating system load. For example, if the published applications you are using
are very processor intensive, you may want to raise the importance of Processor
Usage when calculating overall system load.
Some adjustments may cause system load calculations to appear low
when the server is actually running out of resources. Do not adjust these settings
without a thorough understanding of how the advanced factors interact.
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