Installing and Configuring HP WebQoS Peak on Linux

22 Chapter3

HP WebQoS Peak on Linux for the Apache Web Server

Conﬁguring WebQoS Peak on Linux for Apache

Monitoring the % Priority Requests and Last Allocation Delay

statistics can help in setting a realistic allocation rate. The ﬁrst statistic

will show the system's load due to priority sessions. Reduce the

allocation rate if this number approaches, or is over, 50%. The second

statistic shows how long the user of a deferred session had to wait before

gaining access to the server.After the initial rejection, the user is

prevented from returning to the site for a speciﬁed amount of time. If a

session is allocated, this is the minimum delay that can be scheduled.

You can set this time interval with the directive

HPACRejectedExclusionTime. The default is “300” seconds. For

example, to specify that the user will have to wait 120 seconds before he

can again try to access the site, use the following directive in your

conﬁguration ﬁle:

HPACRejectedExclusionTime 120

Creating an Allocation Page for Deferred Sessions

The following is the default contents of the deferral (allocation) page:

Example 3-2 Server Busy

We are sorry our server is busy, and in order to ensure

adequate levels of service to our current visitors, we cannot

serve you at this time. We have allocated you a position in

line and will serve you as soon as we can.

You will automatically enter the site in mm:ss

(minutes:seconds).

The page has three parts, which can be set independently. The ﬁrst part

is the title (Server Busy). You can change the title with the

HPACDeferralTitle directive. To set the title to “Site Temporarily

Unavailable,” use the following directive in your conﬁguration ﬁle:

HPACDeferralTitle Site Temporarily Unavailable

The second part of the deferral page is an explanatory message, which

can be set with the HPACDeferralMessage directive. An informative

message is likely to span several lines, in which case you have to escape