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NetScaler > Instances > Add. In the Resource Allocation section of the Provision NetScaler page, choose Burstable option
from the Throughput Allocation Mode drop down list for burstable throughput. If you want to use fixed rate of
throughput, select Fixed. By default, fixed mode is set for bandwidth allocation. It is not necessary that all the VPXs work in
the same mode. Each VPX can be configured in different mode.
Note: If you are migrating SDX from a release prior to 10.5.e, then by default all the VPXs are in the fixed allocation mode.
Determining the Maximum Burst Bandwidth for a VPX instance
Updated: 2014-10-14
The extent to which each VPX is allowed to burst is computed through an algorithm. When you provision a VPX with
burstable bandwidth, then each such VPX has to be given a priority. The allocation of burstable bandwidth depends on this
burst priority. The priority varies from P0 to P4 with P0 being the highest priority and P4 being the lowest.
Let us take a case where there are 2 VPX, namely VPX1 and VPX2. The minimum bandwidth allocated to VPX1 and VPX2
are 3Gbps and 2Gbps respectively with a burstable bandwidth of 1Gbps and 500 Mbps each. The following table depicts the
parameters:
VPX Name Parameter Value
VPX1 Minimum assured bandwidth 4Gbps
Maximum Burstable bandwidth 2Gbps
Priority P0
VPX2 Minimum assured bandwidth 2Gbps
Maximum Burstable bandwidth 1Gbps
Priority P1
In the above case, let us assume that the total licensed bandwidth is 8 Gbps. Now, if both the VPX are bursting to their
maximum burstable limit, that is:
1. VPX1 is using its maximum burstable bandwidth, that is 2 Gpbs then it is using a total of 4 + 2 = 6 Gbps
2. VPX2 is using its maximum burstable bandwidth, that is 1 Gpbs then it is using a total of 2 + 1 = 3 Gbps
In this case the maximum bandwidth that is used is more than the licensed capacity of 8 Gbps. So to bring down the usage
to within the licensed capacity, one of the VPX would have to give up its burstable bandwidth. In this case since VPX2 has
lower priority than VPX1, so it gives up its 1 Gbps burstable bandwidth. VPX1 would continue to burst as it has higher priority
than VPX2. In all such scenarios, it is made sure that the minimum guaranteed bandwidth is always honored.
Checking the throughput and data consumption statistics
Updated: 2014-10-14
You can check individual VPX’s throughput and data consumption statistics in graphs. These graphs are accessible from the
Configuration > NetScaler > Instances page. Select a VPX and then click on the Action drop list. From the list select either
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