Selecting a time frame to analyze | 35
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Remember Analysis
Options and Type
The selected the last analysis options are used for any subsequent analysis. This is
useful if you typically use the same analysis options repeatedly.
Selecting a time frame to analyze
The GigaStor Control Panel has two graphs along the top: a Detail Chart and below it a Outline Chart. The Detail
chart shows a shorter time frame. The Outline Chart shows a longer time frame with the Detail Chart being a
portion of time from within Outline Chart.
You can configure the resolution of Detail Charts by clicking the “Screen resolution” option and using the slider
to pick a time resolution. It can be anything from 8 hours/8 weeks so that you can see longer term trends to as
short as 10 nanoseconds/500 nanoseconds to focus on specific issues. At the shorter time resolutions you can
enable microburst analysis. The “Data type” list specifies what type of data appears in the Detail Chart.
You can configure the amount of time shown on the Outline Chart by right-clicking it and choosing “Outline
Time Resolution.” It is measured in multiples of the Detail Chart. You may also choose to show packets or load in
the chart.
If you know the time when something occurred that you want to investigate, you can jump to that time by right-
clicking the Detail Chart and choosing Go to Specific Time.
The FIFO/sampling/cpu gauge on the right side tracks how well GigaStor’s disk hardware is keeping up with the
current trafficload. Its data is only for the
active
GigaStor instance (the data always reads “0” for passive GigaStor
instances) and indicates the following:
FIFO – shows how efficiently the probe is processing and monitoring packets
Sampling – indicates the ratio of how many packets are being sampled/processed compared to the
number of packets witnessed. It is shown as: 1/
sampling divider
CPU – How much CPU the probe is using to sample packets
If the FIFO gauge shows 90% or greater, you should consider reducing the load using one or more of the
following methods:
Allocate more memory to the GigaStor instance.
Activate partial packet capture or reduce the size of portion captured.
Activate dynamic sampling, or increase the fixed sampling ratio.
10%
50%
90%
Bits/sec in Interval
1,000,000
5,000,000
9,000,000
Bytes/sec in Interval
124.476
617,826
1,111,176
Bytes/sec in Interval with IFG
125,000
625,000
1,125,000
Megabytes/sec
0.119
0.596
1.073
# of packets/Interval
82
407
732
Max # of microbursts in Interval
10
10
10
Max bits of duration from Utilization Threshold
100,000
500,000
900,000
# of bits per Duration for microburst
50,000
250,000
450,000
# of packets in Duration
4.064
20.319
36.573
Analyzing data without any filters
1. Select a time frame you want to analyze. See
