MACROMEDIA COLDFUSION MX-CLUSTERCATS Bedienungsanleitung PDF herunterladen (Seite 76)

66 Chapter 4 Configuring Clusters

Server load thresholds

ClusterCATS ensures that your web applications remain available and running at

optimum performance by intelligently managing the HTTP traffic hitting your clustered

servers. By setting load thresholds on each server in your cluster, you can control and

manage your site’s availability and performance. Many of your threshold configuration

decisions hinge on your site’s architecture and where the bulk of your processing

resources must be allocated.

During an HTTP redirection, ClusterCATS evaluates the cluster’s state according to the

HTTP server state first, and then the JRun/ColdFusion server load. This policy is the

same in centralized and distributed ClusterCATS configurations. In a centralized

ClusterCATS cluster with all web servers at one site, ClusterCATS redirects only if the

server is busy or restricted.

For each cluster member, you configure two load thresholds:

• Peak load threshold — the maximum load the server can handle before its

performance degrades significantly or becomes unavailable.

• Gradual redirection threshold — the point at which HTTP requests begin to be

redirected to other less-loaded members in a cluster so the server’s performance does

not degrade or become unavailable.

By default, the peak load threshold is 90% and the gradual redirection threshold is 10%.

These default settings adequately handle HTTP traffic going across most websites.

However, if your website is particularly processing intensive, you should lower both

threshold settings to better accommodate the increased load.

If you want the server to handle as much load as possible, set the threshold values close to

one another. However, if you want redirection to occur well in advance of the server

nearing its peak threshold, set the values farther apart so there is a difference of at least

10% between the two threshold values.

This section shows you how to set the peak and gradual redirection load thresholds for

ClusterCATS Servers in the following sections:

• “Configuring load thresholds in Windows” on page 66

• “Configuring load thresholds on UNIX” on page 69

Configuring load thresholds in Windows

To adjust load thresholds for a cluster member:

1 Open the ClusterCATS Explorer and select a server.

2 Select Server > Properties or right-click the server and select Properties.

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 155 156

Keine Kommentare

MACROMEDIA COLDFUSION MX-CLUSTERCATS Bedienungsanleitung Seite 76