Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 59)

Brocade Virtual ADX Global Server Load Balancing Guide 49
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Configuring GSLB protocol parameters
1
This command changes the number of sampling intervals from 5 to 6 but leaves the sample rate
set to 5 seconds. At any given time, the site ADX device will have the average load for six intervals,
for the previous 5, 10, 15, 20, 25, and 30 seconds. The average connection load will be calculated
based on these six samples.
Syntax: [no] connection-load intervals num-intervals sampling-rate
The num-intervals parameter specifies the number of samples you want the site ADX device to
collect and average together. You can specify 1 – 8 intervals. The default is 5.
The sampling-rate parameter specifies the number of seconds between each sample. You can
specify 1 – 60 seconds. The default is 5 seconds.
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 10. You can individually change the weight to a value from 0
– 10. If you set an interval’s weight to 0, that interval is not included when the intervals are
averaged together.
By default, the site ADX device 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.
Virtual ADX(config-gslb-policy)#connection-load weights 1 1 3 1 1
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 0 – 10. If you enter 0, the interval
is not included when calculating the average load. Enter the weights in the same order as the
sampling intervals.
You do not need to enter weight values for all the intervals once you enter the last non-zero weight.
For example, if you want to set the weight for interval three to 1 but use 0 for the weights of all the
other intervals, you can enter the following command.
Virtual ADX(config-gslb-policy)#connection-load weights 0 0 1
When this command is entered, the weights for the fourth interval and higher are set to 0.