Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 266)

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Clusters

Parameter Minimum Default Maximum Units

idle timeout 0 0 2147483647.0 seconds

stale timeout 1.0 15.0 120.0 seconds

Note that if you change the stale timeout setting while partially established Layer 4 connections are currently in the

queue, those connections will be affected by the new setting.

Application Server Timeouts

Keep in mind that the application server running on the physical servers in your cluster may have its own timeout

parameters that will affect the length of time the server keeps connections to Equalizer and the client open. For

example, an Apache 2 server has two related timeout directives: TimeOut and KeepAliveTimeout:

1. The TimeOut directive currently defines the amount of time Apache will wait for three things:

a. The total amount of time it takes to receive a GET request.

b. The amount of time between receipt of TCP packets on a POST or PUT request.

c. The amount of time between ACKs on transmissions of TCP packets in responses.

2. The KeepAliveTimeout directive specifies the number of seconds Apache will wait for a subsequent request

before closing the connection. Once a request has been received, the timeout value specified by the

Timeout directive applies.

In general, if you want Equalizer to control connection timeouts, you must make sure that any timeouts set on the

application server are of longer duration than the values set on Equalizer.

For example, with respect to the Apache server timeouts above, the client timeout (for Layer 7 connections) or the

idle timeout (for Layer 4 connections) should be of shorter duration than the timeouts set for Apache.

Similarly, the Layer 7 server timeout and connect timeout on Equalizer should be of shorter duration than the TCP

connection timeouts set on the servers.

Connection Timeout Kernel Variables

Equalizer uses a number of kernel variables to track connection timeouts, as shown in the table below. You can

use the sysctl command to display kernel variables. The two basic formats of this command are:

sysctl variable_name Displays the kernel variable variable_name.

sysctl -a > file Displays all kernel statistics. This is a long list, so we recommend capturing

the list to a file.

eq.idle_timeout

The current setting of the Layer 4 global networking idle timeout parameter.

eq.idle_timedout_count

A Layer 4 counter incremented when a connection isterminated because the idle

timeout expired.

eq.stale_timeout

The current setting of the Layer 4 global networking stale timeout parameter.

eq.l7lb.timeouts

The total number of Layer 7 connections dropped because a connection timer

expired.

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