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7.4.5 Estimate required USB memory capacity for snapshot mode
theoretically
In order to prevent the USB memory from overflow when capturing data in
the autonomous mode in snapshot mode, the capacity of the USB memory
device must be sufficiently dimensioned and have reserves to be able to
absorb the amount of data that is expected to occur when recording data
with netANALYZER. To achieve this, you can make a theoretical estimate
of the required size of the USB memory device.
You can specify the maximum number of snapshots to be recorded. For
more information, see the section
Set maximum number of snapshots for
autonomous operating mode [ } page 46].
The size of a snapshot varies depending on the application, the network
load, and the number of Ethernet frames that occur during the recording
period.
Dimension the size of the USB memory device according to the number of
snapshots to be recorded and the expected size of the snapshots.
Prerequisites for the size of the USB memory device are also listed in the
section
Requirements for using the Autonomous operating
mode [
}
page 40].
Example
If in the netANALYZER configuration page under Snapshot behaviour in
autonomous mode the maximum number is set to "4", for example, the
capacity of the USB memory must be at least the size of 4 snapshots. In
this case, a maximum of 4 snapshots will be recorded. To record the data
for the 5th snapshot, the data of the 1st snapshot recorded on the USB
memory device is overwritten again.
Figure 10: Schematic representation of the reserve capacity of the USB memory device with
a maximum number of snapshots = "4
netANALYZER device NANL-B500G-RE | Installation, operation and hardware description
DOC091110UM26EN | Revision 26 | English | 2019-07 | Released | Public © Hilscher 2007-2019