Configuring GSLB protocol parameters | 1 |
Changing the sample interval weight
The interval weights are the relative weights of each data sample within a set of sampling intervals. When the data samples are averaged together, the relative weights of the samples can affect the outcome. You can adjust the load calculation formula by changing the weights of the intervals, so that some intervals are counted more heavily towards the average than other intervals. You can even eliminate the effect of an interval by setting its weight to 0.
For example, if a sampling interval contains six data samples and you assign higher weights to the third and fourth samples than to the others, the third and fourth samples play a larger role when the average connection load is calculated.
The default weight for each interval is 1. You can individually change the weight to a value from
By default, the site ServerIron ADX weighs each data sample equally when calculating the connection average for the GSLB policy. The weight of each interval is 1 by default.
You can change the weights to give more emphasis to some intervals and less emphasis to others. For example, if you are using five intervals, all five have equal influence on the average load calculated by the GSLB policy. If you want to give more emphasis to the third interval, you can give the third interval a higher weight than the other intervals. To ignore an interval when calculating the average, assign the weight 0 (zero) to the interval.
To change sample weights, enter a command such as the following at the GSLB policy level of the CLI.
This command gives more weight to the third sampling interval than to the other intervals, while including all intervals in the calculation of the average connection load.
Syntax: [no] connection-load weights <weight1> [<weight2>...<weight8>]
The <weight> parameters specify the weights. You can specify from
You do not need to enter weight values for all the intervals once you enter the last
When this command is entered, the weights for the fourth interval and higher are set to 0.
Changing the
You can change the following parameters associated with the
•Session capacity threshold: Specifies how close to the maximum session capacity the site ServerIron ADX (remote ServerIron ADX) can be and still be eligible as the best site for the client. This mechanism provides a way to shift load away from a site before the site becomes congested. The default value for the threshold is 90%. Thus a site ServerIron ADX is eligible to be the best site only if its session utilization is below 90%.
•Available session capacity tolerance: Specifies the percentage by which the number of available sessions on the site ServerIron ADX can differ from the number of available sessions on another site ServerIron ADX and still be considered an equally good site.
ServerIron ADX Global Server Load Balancing Guide | 51 |
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