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12.
Required Changes to obj.conf
To enable quality of service, you must include directives in your
invoke two Server Application Functions (SAFs): an AuthTrans
an Error
.
qos-error
The
AuthTrans directive must be the first
qos-handler
the default object in order to work properly. The role of the quality of service
handler is to examine the current statistics for the virtual server, virtual server
class, and global server, and enforce the limits by returning an error.
Enterprise Server includes a built-in sample quality of service handler SAF, called
. This SAF logs when limits are reached, and returns 503 "Server
qos-handler
busy" to the server so that it can be processed by NSAPI.
Enterprise Server also includes a built-in sample error SAF called
returns an error page stating which limits caused the 503 error and the value of the
statistic that triggered the limit. You may want to alter the sample code to provide
different error information.
These samples are available at server_root
can use these samples, or you can write your own SAFs.
For more information on these SAFs and how to use them, see the Netscape
Enterprise Server NSAPI Programmer's Guide.
Known Limitations to Quality of Service
When you use the quality of service features, keep in mind the following
limitations:
•
The connection or bandwidth statistics are not shared across server processes
because of performance. In other words, the setting of
accounted for. So all the limits apply individually to a server process, not to the
aggregate of all processes. For more information on
processes, see the Netscape Enterprise Server Performance Tuning, Sizing, and
Scaling Guide.
•
The quality of service features only measure the HTTP bandwidth at the
application level. The HTTP bandwidth can differ from the actual TCP
network bandwidth for a variety of reasons:
AuthTrans
/plugins/nsapi/examples/qos.c
MaxProc
MaxProcs
Chapter 10
Using Quality of Service
to
obj.conf
and
qos-handler
configured in
which
qos-error
. You
is not
and multiple
Monitoring Servers
223
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